Classification of rocks, minerals, and magma based on the silica content present in them defines them as either mafic or felsic. Massive parts may be young anatectic intrusive rocks; foliated parts may include older felsic metavolcanic rocks belonging to unit Ochv. DILL, H.G. 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. 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) CHAPTER 3 - Igneous Rocks (P. 55-78) MAGMA - molten material and dissolved gas (in the subsurface). Mafic vs Felsic • Mafic and Felsic are categories into which igneous rocks are classified. . Felsic and mafic rocks, division of igneous rocks on the basis of their silica content. Pegmatite bodies are common in the vicinity. Specimen is about 4.5 x 3.5 x 3.5 centimeters. Topaz on albite: A crystal of imperial topaz on an albite matrix from a pocket in the Katlang Pegmatite of Pakistan. Learn more about the Mafic vs. Felsic geological classification through this ScienceStruck article. Most pegmatites are composed of quartz, feldspar and mica; in essence a granite. Pegmatite: Pegmatite is an igneous rock composed almost entirely of crystals that are over one centimeter in diameter. Texture: aphanitic; Composition: mafic (enriched in iron and magnesium) Mafic Vs. Felsic Rocks: Know the Difference. Central body is massive, but outlying strips are foliated and have accessory hornblende or garnet. Mafic rocks are darker and are composed of magnesium and iron. Basalt is an extrusive mafic volcanic rock. (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.- Pegmatites are commonly found in or near the margins of bodies of granite. In The Previous Exercise, The Line In The Pegmatite On The Left Had 1 Black Mineral Out Of The 4 Total Minerals, Indicating That 25% Of The Minerals Along This Line Were Mafic. Pegmatites associated with granitic domes within the Archaean Yilgarn Craton intruding ultramafic and mafic rocks contain red, orange and brown almandine garnet. Felsic composition is higher in silica (SiO 2) and low in iron (Fe) and magnesium (Mg). 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. It is commonly erupted as passive lava flows due to its low viscosity (resulting from high magmatic temperatures and low silica contents). The specimen shown here is about two inches (five centimeters) across. Felsic rocks are light in color and are composed of feldspars and silicates. mafic: Ca-plagioclase, pyroxene, olivine, amphibole: basalt: FROTHY TEXTURE (POROUS, PUMICEOUS) Originates in gas-charged volcanic eruptions, commonly pyroclastic. Question: Part D - Comparison Of Results: Pegmatite Recall That Black Minerals In Igneous Rocks Are Mafic Minerals. For example, granite contains around 70% of silica. 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. Igneous Rock Compositions. A dominant component of oceanic crust, basalt is the most abundant volcanic rock. 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