Basalt is an extrusive mafic volcanic rock. Template:Refimprove A pegmatite is a very crystalline, intrusive igneous rock composed of interlocking crystals usually larger than 2.5cm in size;1 such rocks are referred to as pegmatitic. Most pegmatites are composed of quartz, feldspar and mica; in essence a granite. Felsic composition is higher in silica (SiO 2) and low in iron (Fe) and magnesium (Mg). A dominant component of oceanic crust, basalt is the most abundant volcanic rock. Central body is massive, but outlying strips are foliated and have accessory hornblende or garnet. Igneous Rock Compositions. Topaz on albite: A crystal of imperial topaz on an albite matrix from a pocket in the Katlang Pegmatite of Pakistan. Texture: aphanitic; Composition: mafic (enriched in iron and magnesium) The most common igneous compositions can be summarized in three words: mafic (basaltic), intermediate (andesitic), and felsic (granitic). Specimen is about 4.5 x 3.5 x 3.5 centimeters. Felsic and mafic rocks, division of igneous rocks on the basis of their silica content. Question: Part D - Comparison Of Results: Pegmatite Recall That Black Minerals In Igneous Rocks Are Mafic Minerals. Pegmatite bodies are common in the vicinity. Mafic vs Felsic • Mafic and Felsic are categories into which igneous rocks are classified. DILL, H.G. Felsic rocks are light in color and are composed of feldspars and silicates. Pegmatites associated with granitic domes within the Archaean Yilgarn Craton intruding ultramafic and mafic rocks contain red, orange and brown almandine garnet. Chemical analyses of the most abundant components in rocks usually are presented as oxides of the elements; igneous rocks typically consist of approximately 12 major oxides totaling over 99 percent of the rock.Of the oxides, silica (SiO 2) is usually the most abundant. It is commonly erupted as passive lava flows due to its low viscosity (resulting from high magmatic temperatures and low silica contents). Pegmatite: Pegmatite is an igneous rock composed almost entirely of crystals that are over one centimeter in diameter. Intermediate rocks are composed of the minerals amphibole and feldspar and contain a combination of light and dark minerals. All Felsic rocks contain a high percentage of silica. For example, granite contains around 70% of silica. Garnet, commonly almandine or spessartine, is a common mineral within pegmatites intruding mafic and carbonate-bearing sequences. (2018) Geology and chemistry of Variscan-type pegmatite systems (SE Germany- With special reference to structural and chemical pattern recognition of felsic mobile components in the crust.- Classification of rocks, minerals, and magma based on the silica content present in them defines them as either mafic or felsic. Mafic Vs. Felsic Rocks: Know the Difference. Composition Most Common Minerals Rock Name; felsic: glass (may contain a few minerals typical of felsic rocks) pumice: mafic: glass (may contain a few mineral typical of mafic rocks) The most important molten materials are the silicate melt composed of Silicon and Oxygen and Other dissolved atoms, particularly aluminum, iron, calcium, sodium, potassium, and magnesium. Mafic rocks are darker and are composed of magnesium and iron. mafic: Ca-plagioclase, pyroxene, olivine, amphibole: basalt: FROTHY TEXTURE (POROUS, PUMICEOUS) Originates in gas-charged volcanic eruptions, commonly pyroclastic. . Felsic, intermediate and mafic igneous rocks differ in their mineral composition. The specimen shown here is about two inches (five centimeters) across. Massive parts may be young anatectic intrusive rocks; foliated parts may include older felsic metavolcanic rocks belonging to unit Ochv. Pegmatites are commonly found in or near the margins of bodies of granite. 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