Felsic rocks are light in color and are composed of feldspars and silicates. Felsic rocks are light in color and are composed of feldspars and silicates. Obsidian is an easily recognizable igneous rock. Basalt, one of the common examples of Mafic rock has only 50% silica content. - Properties, Types & Uses, Optical Properties of Minerals: Luster, Light Transmission, Color & Streak, Intrusive Igneous Rock: Definition & Examples, Basaltic Lava: Definition & Characteristics, Bowen's Reaction Series: Crystallization Process & Magmatic Differentiation, Contact Metamorphism Vs. The minerals present in the two is also the reason due to which there is a contrasting difference in their characteristic appearance. 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. Basalt is a mafic extrusive igneous rock formed from the rapid cooling of magnesium-rich and iron-rich lava exposed at or very near the surface of a terrestrial planet or a moon. Mafic rocks are abundant in the Earth's crust beneath the oceans. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. The high silica content (70-85%) is because of the geographical location the felsic rocks are found at. MAFIC Mafic lava is basically known as rock formation basalt. In the simplified classification, the intermediate (intermediate toned) aphanitic, crystalline igneous rock is andesite. answer! Most of these rocks are gray though Mafic rocks are also found in brown, green, and even black colors. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.Felsic magma or lava is higher in viscosity than mafic magma/lava.Felsic rocks are usually light in color and have specific gravities less than 3. The most common examples of rocks classified as Mafic are gabbro, dolerite, and basalt. Mafic is rich in heavy minerals like magnesium and ferric, or iron. Mafic lava forms basalt and is associated with the lava flows seen on the Hawaiian Islands and similar shield volcanoes. BASALT Basalt is an extrusive mafic volcanic rock. Porphyritic Basalt. Felsic magma or lava is higher in viscosity than mafic magma/lava. felsic: glass (may contain a few minerals typical of felsic rocks) pumice: mafic: glass (may contain a few mineral typical of mafic rocks) scoria: Note: Basalt with fewer holes, known as vesicles, is called vesicular basalt. Rhyolite: felsic with an aphanitic texture (so fine-grained that their component mineral crystals are not detectable by the unaided eye) Basalt porphyry: mafic with a porphyritic texture (containing distinct crystals or crystalline particles embedded in a fine-grained groundmass) This is the main reason for the low density of felsic rocks. Well, as you can see, mankind is very good when a need arises to make simple concepts difficult to understand. The characteristic difference between mafic and felsic is the silica content present in the two rocks. On the other hand, Felsic has much higher levels of silica. It is commonly erupted as passive lava flows due to its low viscosity (resulting from high magmatic temperatures and low silica contents). Gabbro and basalt are both dark Texture: granite shows a range of grain sizes. Mafic and felsic are not commonly used terms, as one may observe. All rights reserved. The below picture is of the mafic rock basalt. Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic. What is a metamorphic rock formed from basalt? Graphite is found to have 70% of silica. It offers compelling performance, enabling lightweight composites of the future. Felsic rocks, in general, form the bulk of the continental plates, while mafic basalt forms the seafloor. This is since their origin is mostly the sea bed, that is not abundant in silica. Mafic rocks are darker and are composed of magnesium and iron. as coarse-grained plutonic rocks are porphyraceous. Thus, these rocks have low density unlike mafic rock, which have high density are heavy. The mineral grains in such rocks can generally be recognized with the bare eye. Igneous rocks 20 Terms. These rocks are also rich in other minerals like oxygen, potassium and sodium. Mafic means that the rock or lava has less silica while felsic means that the lava or rock has the greatest silica. nadineklein. youfancyyhuh. It is commonly erupted as passive lava flows due to its low viscosity (resulting from high magmatic temperatures and low silica contents). Mafic magma is less viscous than felsic magma. A common mafic rock is basalt. Hence, rhyolite and basalt as fine-grained volcanic rocks are porphyritic and granite, syenite, etc. Although, the two are igneous rocks, which are defined by their levels of silica, the difference in the silica content in the two rocks, is its origin. Elord19. Mafic Rock. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Mafic definition, of or relating to rocks rich in dark, ferromagnesian minerals. Basalt qualifies as a mafic igneous rock because of its high level of magnesium oxide. felsic: glass (may contain a few minerals typical of felsic rocks) pumice: mafic: glass (may contain a few mineral typical of mafic rocks) scoria: Note: Basalt with fewer holes, known as vesicles, is called vesicular basalt. intermediate. Mafic rock is commonly contrasted with felsic rock, in which light-coloured minerals predominate. Mafic is the acronym for magnesium and ferric (Latin for Iron) because this igneous rock is rich in these two minerals. 4.Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. “Mafic” is a term used to describe the densest lava flows. A dominant component of oceanic crust, basalt is the most abundant volcanic rock. The difference between Mafic and Felsic rocks are the silica content present. What are bright streaks around a moon crater? Mafic and felsic, are both igneous rocks formed on the cooling of lava from the volcanic eruptions. tennisqueena. Composition is Mafic, Texture is Vesicular, therefore the rock is Scoria. b. volcanoes lie above transform faults. The lavas that are cooled to form these rocks are also different, in terms of their viscosity. Felsic rocks are light in color and are composed of feldspars and silicates. A dominant component of oceanic crust, basalt is the most abundant volcanic rock. Mafic and felsic are the terms used to describe the silica content of igneous rocks formed on the cooling of lava. Common mafic rocks include basalt, dolerite, and gabbro. 4.Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. No. Mafic customers use basalt products to save weight, improve performance, and remain cost competitive. Mafic rocks are obtained from mostly the sea bed volcanoes whereas felsic rocks are obtained from the cooling of lavas from the convergent zones. The word derives from a composite of the chemical symbols for Magnesium (Ma) and Iron (Fe). Approximately, 70-85%. Mafic is an adjective describing a silicate mineral or igneous rock that is rich in magnesium and iron, and is thus a portmanteau of magnesium and ferric. The few that know the existence of these words are mainly geologists or ones related to that field of study. Texture: aphanitic; Composition: mafic (enriched in iron and magnesium) Igneous Rocks. The mafic magmas are somewhat more viscous than the ultramafic magmas, but they are still fairly fluid. Felsic rocks and magma contain high levels of feldspar and silicon. Porphyritic Granite. This gives these rocks their characteristic dark green or greenish-black colour. Composed of magnesium and iron ( Fe ) broad sense Islands and shield! Lavas also contain calcium-rich varieties of plagioclase feldspar that of mafic minerals are dark in color and... Of basalt but most of these rocks have about 50 percent silica high... 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