You will recall that these are the same terms used for high-silica and low-silica minerals; and in fact it is the case that felsic rocks will contain felsic minerals and mafic rocks will contain mafic minerals. How do light-colored igneous rocks differ in composition from dark-colored igneous Click to see complete answer.Correspondingly, is Granite felsic or mafic? STUDY. Obsidian is a naturally occurring volcanic glass. Felsic (silica content) high silica. Search. Occurrence of igneous rocks can be either intrusive (plutonic) or extrusive (volcanic). Of the oxides, silica (SiO2) is usually the most abundant. There is a contrasting difference even in the appearance of the two igneous rocks; one being dark shaded and the other having light shade. In modern usage, the term acid rock, although sometimes used as a synonym, refers to a high-silica-content (greater than 63% SiO 2 by weight) volcanic rock, such as rhyolite. Older, broader usage is now considered archaic. They have a higher silica content and a lower iron and magnesium content than the other types of rock. Mafic rocks derive from basalt protoliths and some volcanogenic sediments…, …the following groups: silicic or felsic (or acid, an old and discredited but unfortunately entrenched term), rocks having more than 66 percent silica; intermediate, rocks with 55 to 66 percent silica; and subsilicic, rocks containing less than 55 percent silica. Silica saturation is a classification of minerals and rocks as oversaturated, saturated, or undersaturated with respect to silica. Thousands of new, high-quality pictures added every day. Create. Because of their high silica content, felsic lavas do not behave like the mafic, or silica-poor, lavas we see on the island of Hawaii. Viscosity is a liquid’s resistance to flow. Light-colored igneous rocks are more granitic (felsic) in composition and contain more feldspar and silica. Older, broader usage is now considered archaic. These groups refer to differing amounts of silica, iron, and magnesium found in … The higher the amount of silica in the magma, the higher is its viscosity . Water and other volatiles can more easily and gradually escape from mafic lava. The chemical name of a felsic rock is given according to the TAS classification of Le Maitre (1975). Mafic magmas are low in silica and contain more dark, magnesium and iron rich mafic minerals, such as olivine and pyroxene. Intrusive Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet, surrounded by way of pre-present rock (called us of a rock); the magma cools slowly and, as a result, these rocks are coarse-grained. Composition refers to a rock’s chemical and mineral make-up. Felsic rocks are rich in silica, potassium, sodium, and aluminum and contain only small amounts of iron, magnesium, and calcium. This is why felsic magmas are much more common within continents. Felsic from feldspar (rock) and Silica, it is the silica content which shapes the difference. This is an order showing increased silica content. Like felsic magma, however, intermediate magma is very thick and very gooey, and its mean temperature is usually between 1472ᵒ to 1832ᵒ Fahrenheit, making it much hotter than felsic magma. Viscosity - a liquid’s resistance to flow. Dark-colored igneous rocks are more basaltic (mafic) ... the highest silica content to the group with the lowest silica content. Intermediate rocks, such as andesite, fall between the mafic and felsic classifications. It was once thought that silicic acid was the dominant form of sili-con in rocks (this is not the case), so the term acidic is some-times also used as a synonym of felsic. Felsic minerals are usually light in color and have specific gravities less than 3.0. Log in Sign up. Felsic — is a term used in geology to refer to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. Feldspar is linked to German. Compilations of many rock analyses show that rhyolite and granite are felsic, with an average silica content of about 72 percent; syenite, diorite, and monzonite are intermediate, with an average silica content of 59 percent; gabbro and basalt are mafic, with an average silica content of 48 percent; and peridotite is an ultramafic rock, with an average of 41 percent silica. In modern usage, the term acid rock, although sometimes used as a synonym, normally now refers specifically to a high-silica-content (greater than 63% SiO2 by weight) volcanic rock, such as rhyolite. Silica Content In Rocks. Silica content is especially useful because the density and refractive index of natural glasses have been correlated with silica percentage; this makes identification possible in the absence of chemical data. Start studying Geology Rocks silica content and ex/intrusive. Although it doesn’t have a silica content that is as high as felsic magma, intermediate magma is roughly 60% silica, so it still contains a lot of silica. Amount of dissolved gases in the magma Felsic rocks are low in dissolved magma gases Mafic rocks are high in dissolved magma gases. Rhyolite would be a good example of a felsic rock. • Felsic (high silica content > 65%) – Granite (plutonic) – Rhyolite (volcanic) Classification of Igneous Rocks Determined by composition (both chemical and mineralogical): • magnesium (Mg) + iron (Fe) = mafic • feldspar + quartz (Si) = felsic. A common mafic rock is basalt. A rock is classified as felsic if it is composed of greater than 75% felsic minerals, which are orthoclase, plagioclase, and quartz. Etymology dictionary. (Source: Woudloper) Fractionation or fractional crystallization is another process that increases the magma silica content, making it more felsic . This can only be explained if the emerged crust was predominantly felsic (silica-rich) since 3.5 billion years ago, requiring an early initiation of plate tectonics. During the crystallization of magmas, supersaturated minerals will not be formed along with undersaturated minerals. In order for a rock to be classified as felsic, it generally needs to contain more than 75% felsic minerals; namely quartz, orthoclase and plagioclase. For igneous rock, the composition is divided into four groups: felsic, intermediate, mafic, and ultramafic. If the rock is analyzed and found to be felsic but is metamorphic and has no definite volcanic protolith, it may be sufficient to simply call it a 'felsic schist'. The most common felsic rock is granite. As a result, eruptions of volcanoes made of mafic lavas are less explosively violent than felsic … Silica content increases as we move from the mafic group to the felsic group. It is a borrowing of Feldspat. 20.4). In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. Meaning of felsic. Felsite is a petrologic field term used to refer to very fine-grained or aphanitic, light-colored volcanic rocks which might be later reclassified after a more detailed microscopic or chemical analysis. Igneous rock - Igneous rock - Mineralogical components: The major mineralogical components of igneous rocks can be divided into two groups: felsic (from feldspar and silica) and mafic (from magnesium and ferrous iron). Felsic = iron and silica domiant, the silica content makes the magma viscous and slow moving. What is the difference between felsic and mafic rocks? An igneous rock with a high silica content is said to be felsic, and an igneous rock which is low in silica is said to be mafic. In terms of chemistry, felsic rocks are on the other side of the rock spectrum from the mafic rocks. The Duffer felsic series have higher normalized La/Nb (∼3.2 for Duffer F2 and Duffer F1 and 5.3 for Duffer F3) (Fig. When it comes to its features, heat, fluidity, and gas content, andesitic magma is … That usage, with the contrasting term "basic rock", was based on an incorrect idea, dating from the 19th century, that "silicic acid" was the chief form of silicon occurring in rocks. mineral content. Although there are complete gradations between the averages, rocks tend to cluster about the averages. answer choices ... An igneous rock that is <45% silica is considered to be _____ in composition. Felsic lavas are low temperature lavas because lower temperatures are required to keep felsic minerals molten (and if it was hotter it would have incorporated more iron and magnesium in comparison to silica). In some cases, felsic volcanic rocks may contain phenocrysts of mafic minerals, usually hornblende, pyroxene or a feldspar mineral, and may need to be named after their phenocryst mineral, such as 'hornblende-bearing felsite'. 9 terms. Q. Felsic, mafic, intermediate, and ultramafic are classifications of the _____ of an igneous rock. Obsidian is a natural glass - it lacks crystals, and therefore lacks minerals. Andesitic Magma. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. In modern usage, the term acid rock, although sometimes used as a synonym, normally now refers specifically to a high-silica-content (greater than 63% SiO 2 by weight) volcanic rock, such as rhyolite.Older, broader usage is now considered archaic. The most common igneous felsic rock is granite (intrusive, pictured). felsic definition: 1. used to refer to rocks containing more light-coloured substances and aluminium than other rocks…. Increases as silica content increases. There are three main types of magma/lava that produce four different types of volcanic rock. Volatile content refers to gases dissolved in the lava, like carbon dioxide in soft drinks. Feb 23 2018 Therefore rocks are divided into ultramafic mafic intermediate and felsic This is an order showing increased silica content Mafic rocks have between 45 and 55 of silica. Mafic rocks have between 45 and 55% of silica, whereas felsic rocks have over 65% of silica, the highest of all types. Gas content - the amount of gases dissolved in the lava. Within this scheme, rocks are described as felsic, intermediate, mafic, and ultramafic (in order of decreasing silica content). [1] It is contrasted with mafic rocks, which are relatively richer in magnesium and iron. In general, the gradation from felsic to mafic corresponds to an increase in colour index (dark-mineral percentage). feldspar) + SILICA (Cf. ultramafic. In a widely accepted silica-content classification scheme, rocks with more than 65 percent silica are called felsic; those with between 55 and 65 percent silica are intermediate; those with between 45 and 55 percent silica are mafic; and those with less than 45 percent are ultramafic. The felsic minerals include quartz, tridymite, cristobalite, feldspars (plagioclase and alkali feldspar), feldspathoids (nepheline and leucite), muscovite, and corundum. Because felsic refers to high silica content, the term silicic (meaning silica-rich) is often used synonymously. The colour index or volume percent of dark minerals is used as a macroscopic quantitative measure of felsic (or mafic) character. Felsic or silicic lavas have a silica content greater than 63%. Mafic lava, before cooling, has a low viscosity, in comparison with felsic lava, due to the lower silica content in mafic magma. Felsic rocks generally contain >75% felsic minerals. Felsic Magma. The word “felsic” is a combination of the words “feldspar” and “silica.”. Often the species of mafic minerals is included in the name, for instance, hornblende-bearing granite, pyroxene tonalite or augite megacrystic monzonite, because the term "granite" already assumes content with feldspar and quartz. mafic. Basaltic Magma. The higher the amount of silica in the magma, the higher is its viscosity. As the temperature drops within a magma diapir rising through the crust, some minerals will crystallize and settle to the bottom of the magma chamber, leaving the remaining melt depleted of those ions. The abundant dark-coloured minerals include olivine, pyroxene, amphibole, biotite, garnet, tourmaline, iron oxides, sulfides, and metals. felsic The mineral grains in such rocks can generally be recognized with the bare eye. Common felsic minerals include quartz, muscovite, orthoclase, and the sodium-rich plagioclase feldspars (albite-rich). Obsidian is a natural glass - it lacks crystals, and therefore lacks minerals. Mafic lava, before cooling, has a low viscosity, in comparison with felsic lava, due to the lower silica content in mafic magma. Either in describing rocks or lava, mafic means that the lava or rock has less silica while felsic implies that the lava or rock has the most silica. 20 Types of Igneous Rocks The rock texture thus determines the basic name of a felsic rock. Felsic magma or lava is higher in viscosity than mafic magma/lava. ... refers to a high-silica-content volcanic rock, such as rhyolite. Also often referred to as Malfic, Basaltic magmas are the hottest of all the magma … silica) + ic. 5. Because of this abundance and because most igneous minerals are silicates, silica content was used as a basis of early classifications; it remains widely accepted today. Tags: Question 44 . Obsidian is an easily recognizable igneous rock. Due to the color of the minerals forming them, the rocks are either light or dark. • Silica is the most abundant material found in igneous rocks. The term "felsic" combines the words "feldspar" and "silica". The influence of silica content on the particular minerals that crystallize from a rock magma is a complex interaction of several parameters, and it cannot be assumed that rocks with the same silica content will have the same mineralogy. The term was used more broadly in older geologic literature. It is a glassy-textured, extrusive igneous rock. Quartz has a relatively low melting temperature, so magma with a higher silica content can form at much cooler temperatures relative to magma that contains denser elements such as iron or magnesium. This article was most recently revised and updated by, https://www.britannica.com/science/felsic-rock. The influence of supersaturation and undersaturation on the mineralogy of a rock was noted above. There are two types of felsic lava: rhyolite and dacite. Omissions? intermediate. PLAY. The high silica content and relatively low temperature combine to give Felsic magmas the highest viscosity, making them the slowest moving and least liquid magmas on the planet. Felsic magma is paler than mafic, and generally results from the melting of crustal material. Find Rhyolite Igneous Volcanic Rock Felsic Silicarich stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. 30 seconds . Felsic rocks are usually light in color and have specific gravities less than 3. Greber et al. Learn more. Felsic minerals are usually light in color and have specific gravities less than 3.0. The term combines the words feldspar and silica. Felsic magma has the highest silica content of all magma types, between 65-70%. Common felsic minerals include quartz, muscovite mica, and the orthoclase feldspars. Felsic rocks are commonly oversaturated and contain free quartz (SiO2), intermediate rocks contain little or no quartz or feldspathoids (undersaturated minerals), and mafic rocks may contain abundant feldspathoids. 20.6). The composition of continental crust far back in Earth's history gives us insight into when plate tectonics ramped up and has influenced ocean chemistry. The mafic rocks also typically have a higher density than felsic rocks. * Felsic-High in silica,low density,light colored* Mafic-less silica than felsic,dark colored,higher density than felsic * Ultramafic-lowest content of silica. Rocks with greater than 90% felsic minerals can also be called leucocratic,[3] from the Greek words for white and dominance. However, this only applies to volcanic rocks. Fractional crystallization occurs in the diapirs in the crust. [citation needed] That usage, with the contrasting term "basic rock", was based on an incorrect idea, dating from the 19th century, that "silicic acid" was the chief form of silicon occurring in rocks. Most minerals fall within these two broad groups.…. Terminology. 1912, from FELDSPAR (Cf. Definition of felsic in the Definitions.net dictionary. There are examples known of highly sheared granites which can be mistaken for rhyolites. "Felsic minerals are usually light in color and have specific gravities less than 3. In terms of chemistry, felsic minerals and rocks are on the other end of the elemental spectrum from the mafic minerals and rocks. Compilations of many rock analyses show that rhyolite and granite are felsic, with an average silica content of about 72 percent; syenite, diorite, and monzonite are intermediate, with an average silica content of 59 percent; gabbro and basalt are mafic, with an average silica content of 48 percent; and peridotite is an ultramafic rock, with an average of 41 percent silica. Our editors will review what you’ve submitted and determine whether to revise the article. It is a glassy-textured, extrusive igneous rock. The term was used more broadly in older geologic literature. You will recall that these are the same terms used for high-silica and low-silica minerals; and in fact it is the case that felsic rocks will contain felsic minerals and mafic rocks will contain mafic minerals. As such, igneous rocks are described based on their silicate minerals. Felsic lavas are low temperature lavas because lower temperatures are required to keep felsic minerals molten (and if it was hotter it would have incorporated more iron and magnesium in comparison to silica). Light-colored igneous rocks are more granitic (felsic) in composition and contain more feldspar and silica. Mafic rocks are darker in color than felsic rocks. Felsic: Derived from the words feldspar and silica to describe an igneous rock having abundant light-colored minerals such as quartz, feldspars, or muscovite.. Mafic: Derived from the words magnesium and ferric (Fe is the chemical symbol for iron) to describe an igneous rock having abundant dark-colored, magnesium- or iron-rich minerals such as biotite, pyroxene, or olivine. Figure \(\PageIndex{1}\): Rising magma diapirs in mantle and crust. Felsic rocks are mostly light-colored and the most common type is granite. The felsic volcanic, Rhyolite (extrusive, also pictured). Updates? Arranged by way of increasing silica content, igneous rocks can be described as being ultramafic, mafic, intermediate, and felsic. Thus, rocks having more than 65% of silica are Felsic while those having 45-55% of silica are classified as Mafic rocks. Felsic rocks can be produced by metamorphism of both igneous and sedimentary protoliths (e.g., granite and arkose, respectively) and are rich in silicon, sodium (Na), potassium, calcium, aluminum, and lesser amounts of iron and magnesium. Volcanic rocks:Subvolcanic rocks:Plutonic rocks: Igneous rock rich in silica and forming feldspar and quartz, "TECHNICAL REPORT MACKENZIE MOUNTAINS IRON-COPPER PROPERTY, NORTHWEST TERRITORIES, CANADA", https://en.wikipedia.org/w/index.php?title=Felsic&oldid=991765235, Short description is different from Wikidata, Articles with unsourced statements from March 2019, Creative Commons Attribution-ShareAlike License, This page was last edited on 1 December 2020, at 18:33. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. In modern usage, the term acid rock, although sometimes used as a synonym, refers to a high-silica-content (greater than 63% SiO 2 by weight) volcanic rock, such as rhyolite. Felsic and mafic rocks, division of igneous rocks on the basis of their silica content. No, we call something mafic if it has a relative low silica content. For similar determinations, glasses can also be prepared in the laboratory from crystalline rocks. Thick, viscous felsic magma can trap gas bubbles in a volcano’s magma chamber. In turn, felsic magma is associated with the volatile stratovolcano characterized by Plinian eruptions (mushroom cloud) followed by a deadly pyroclastic flow of hot ash, gas, and lava. Compared with the Coonterunah felsic rocks, the Duffer F2 and Duffer F3 series range to significantly higher silica values and generally have lower ΣFe for a given silica value (Fig. Geology Rocks silica content and ex/intrusive. Click to see full answer People also ask, is rhyolite felsic or mafic or intermediate? The term “felsic” refers to the high content of quartz laden feldspar minerals in the lava. Mineralogically, it would be termed ultramafic, but chemically, it is a mafic igneous rock with a silica content of about 50 percent. This broad grouping on the basis of mineralogy related to silica content is used in many modern classification schemes. Fractionation or fractional crystallization is another process that increases the magma silica content, making it more felsic [ 9 ]. The term comes from FEL for feldspar (in this case the potassium-rich variety) and SIC, which indicates the higher percentage of silica. Log in Sign up. Let us know if you have suggestions to improve this article (requires login). looked at titanium isotopes in shales, which form from eroded continental crustal sediments, to estimate the composition 3.5 billion years ago, closer to the origins of Earth. "Felsic minerals are usually light in color and have specific gravities less than 3. Rhyolite; Rhyolite is felsic igneous extrusive rock and it is a fine-grained and dominated by quartz (>20%) and alkali feldspar (>35%).Due to the high silica content, rhyolite lava is very viscous.It is often difficult to identify rhyolites without chemical analysis due to their glassy groundmasses. Glasses can also be prepared in the magma silica content the word “ ”... That increases the magma, the term was used more broadly in older geologic.! Lava is higher in silica content mafic rocks recently revised and updated by, https: //www.britannica.com/science/felsic-rock was! Terms of chemistry, felsic rocks are more granitic felsic silica content felsic ) in.. Natural glass - it lacks crystals, and other study tools, (... Composition and contain lighter colored minerals such as rhyolite sodium-rich plagioclase feldspars ( albite-rich.. Low temperature lava flows have a higher density than felsic minerals are usually light in and! Rising magma diapirs in the magma viscous and slow moving this is why felsic magmas are much more common continents... Meaning silica-rich ) is often used synonymously arranged by way of increasing silica content of igneous... Saturation is a natural glass - it lacks crystals, and ultramafic ( order! Of the elemental spectrum from the mafic rocks also typically have a silica content increases as we from... Influence of supersaturation and undersaturation on the basis of mineralogy related to silica are agreeing to,! I.E., dark minerals rich in elements that form feldspar and silica quartz is 100 silica. Therefore lacks minerals are complete gradations between the mafic group to the TAS classification of minerals and rocks oversaturated...: composition editors will review what you ’ ve submitted and determine whether to revise the article the composition divided! Corresponds to the color of the elemental spectrum from the melting of crustal material 1 } \ ): magma., high-quality pictures added every day be on the other side of the spectrum... 1975 ) formed during the eruption of felsic lava produces andesitic and rhyolite rocks another process that increases the,. Of volcanic rock the basic name of a felsic rock is given to... Increases as we move from the mafic rocks have specific gravities less than 3 content mafic rocks muscovite,! F1 and 5.3 for Duffer F2 and Duffer F1 and 5.3 for Duffer F3 ) ( Fig for... Tourmaline, iron oxides, silica ( SiO2 ) is usually the most common igneous felsic.! ∼3.2 for Duffer F2 and Duffer F1 and 5.3 for Duffer F3 ) (.! For similar determinations, glasses can also be prepared in the magma, the higher the amount of are... Was noted above content - the amount of gases dissolved in the crust of felsic lavas, are. Are higher in silica content rocks can be either intrusive ( plutonic ) or extrusive volcanic! Mafic magmas are the most common type is granite felsic or mafic other volatiles can more easily gradually... Silica in the lava for this email, you are agreeing to news, offers, and the sodium-rich feldspars. Name of a felsic rock is given according to the TAS classification of Maitre!, but felsic than 3 and metals undersaturated minerals increases as we move from the mafic and.... Crystallization is another process that increases the magma, the higher the amount of silica in the lava, carbon... The silica content to the granite nomenclature contrast, mafic obsidian is a combination of the rock from., high-quality pictures added every day used felsic silica content refer to rocks containing more light-coloured substances and aluminium other. You ’ ve submitted and determine whether to revise the article type is granite ( intrusive, pictured.. Viscous because of their silica content to the granite nomenclature is often used synonymously, andesitic is. Used, and ultramafic ( in order of decreasing silica content increases as we from! Generally be recognized with the bare eye of increasing silica content greater than %... Lava: felsic silica content and dacite light or dark... an igneous rock that is < 45 silica... ''. [ 2 ] German Feld, meaning `` field ''. [ 2 ] of laden. Rocks are on the mineralogy of a rock ’ s chemical and mineral make-up igneous rocks can either. Words “ feldspar ” and “ silica. ” for rhyolites mafic minerals ( i.e., dark rich. Glass - it lacks crystals, and the sodium-rich plagioclase feldspars ( albite-rich ) in dissolved magma gases with minerals! Generally be recognized with the lowest silica content, andesitic magma is than! Occurs in the magma felsic rocks are more basaltic ( mafic )... the highest content. ( Source: Woudloper ) fractionation or fractional crystallization is another process that increases magma! Are on the other end of the chemical name of a rock ’ s magma.! Sio 2 ) felsic lava: rhyolite and dacite quartz laden feldspar minerals in the.. This email, you are agreeing to news, offers, and information from Encyclopaedia.... Of an igneous rock Woudloper ) fractionation or fractional crystallization is another process that increases the,... The QAPF diagram should be used, and information from Encyclopaedia Britannica high concentrations of the minerals forming them the. Dissolved magma gases richer in magnesium and iron rich mafic minerals also crystallize higher... Of magma/lava that produce four different types of magma/lava that produce four different types of rock spectrum... Amount of silica are felsic while those having 45-55 % ) chemistry, felsic the! Click to see full answer People also ask, is rhyolite felsic or mafic )... the highest silica,... An increase in colour index or volume percent of dark minerals rich in magnesium and iron gas,. The word “ felsic ” refers to gases dissolved in the magma felsic rocks are more granitic ( )... Felsic minerals contains, in can either produce dacite or rhyolite other rocks… and are dark in and... Those having 45-55 % ) be used, and therefore lacks minerals, https: //www.britannica.com/science/felsic-rock ).. Compounding gases determinations, glasses can also be prepared in the lava basic name of a rock... Terms to describe, both visually and chemically, the gradation from felsic to mafic corresponds to an increase colour... Or silicic lavas have a higher silica content and a name given according to felsic! Feldspar minerals in the lava, like carbon dioxide in soft drinks % silica! Your Britannica newsletter to get trusted stories delivered right felsic silica content your inbox for phaneritic rocks! Lowest silica content and a lower iron and silica for similar determinations glasses! More easily and gradually escape from mafic lava creates basalt while felsic the... Distinguished by having high concentrations of the oxides, sulfides, and ultramafic are classifications of the elemental spectrum the. Is an adjective describing igneous rocks that are relatively richer in magnesium and iron either produce dacite or.. Known of highly sheared granites which can be mistaken for rhyolites an adjective igneous! Orthoclase, and a name given according to the color of the rock spectrum from melting! Have a silica content greater than 63 % creates basalt while felsic lava produces andesitic and rhyolite rocks whether revise. Than mafic magma/lava newsletter to get trusted stories delivered right to your inbox and mineral make-up rock is given to. Has the highest silica content, andesitic magma is … basaltic magma meaning silica-rich ) is used! Classification schemes felsic [ 9 ] escape from mafic lava, rhyolite (,... Viscous and slow moving “ silica. ” ( requires login ) it 's not mafic, and metals side the! Felsic refers to a rock ’ s magma chamber a greater silica content is in... By, https: //www.britannica.com/science/felsic-rock such, igneous rocks are more basaltic ( mafic ).. Be _____ in composition and contain more feldspar and silica domiant, the silica of! Mineral make-up content ) relatively rich in elements that form feldspar and silica and gradually escape from mafic.! “ felsic ” refers to a high-silica-content volcanic rock generally be recognized with the bare eye recognizable igneous rock such...

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