Igneous rock (derived from the Latin word ignis meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic.Igneous rock is formed through the cooling and solidification of magma or lava.. Chemically, mafic rocks are enriched in iron, magnesium and calcium and typically dark in color. Intermediate--explosive with periods of quieter lava flows C. Felsic--totally explosive VIII. Mafic magma has a very high mean temperature – between 1832ᵒ and 3632ᵒ Fahrenheit – which is one of the reasons that its viscosity is a little lower than other types of magma. Three lava types 1.Basalt(mafic): Low viscosity. It might be outdated or ideologically biased. If youre looking for actual rocks, granite and basalt. Common mafic rocks include basalt, diabase and gabbro. 2, intermediate & felsic rocks I. … It might be outdated or ideologically biased. Other articles where Intermediate rock is discussed: felsic and mafic rocks: …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 U.S. Supreme Court: Who Are the Nine Justices on the Bench Today? Intermediate rocks are roughly even mixtures of felsic minerals (mainly plagioclase) and mafic minerals (mainly hornblende, pyroxene, and/or biotite). A. Mafic--quiet and free flowing B. 3.Rhyolite/Felsic(Granitic): Super viscous. The temperature of cooling determines which types of minerals are found in the rock and helps scientists classify the rock as felsic, intermediate or mafic. In particular, I examine the use of types and intermediate representations in the system implementation. Intermediate igneous rocks tend to have intermediate shades or colors (green, gray, brown). Ultramafic extrusive rocks. Intermediate Rock igneous rock containing 56–65 percent silica. Rocks that begin their cooling at low temperatures are rich in minerals containing silicon, potassium and aluminum. [citation needed]. Intermediate igneous rocks tend to be gray and lighter in color than mafic rocks (basalts & gabbros). Mafic rocks often also contain calcium-rich varieties of plagioclase feldspar. Many students confuse between the two adjectives Mafic and Felsic. The color distinction comes from the differences in iron and magnesium content. Felsic Magma Intermediate igneous rocks tend to have intermediate shades or colors (green, gray, brown). Intermediate Rock igneous rock containing 56–65 percent silica. Short Distance. Three general types are recognized: Basaltic magma -- SiO 2 45-55 wt%, high in Fe, Mg, Ca, low in K, Na Andesitic magma -- SiO 2 55-65 wt%, intermediate. Mafic composition is higher in iron and magnesium and lower in silica. If they erupt from volcanoes onto the surface as lava, they are called extrusive rocks.By contrast, Intrusive rocks are formed from magma that cools underground. As a result, eruptions of volcanoes made of mafic lavas are less explosively violent than felsic-lava eruptions. Types of Lava. Felsic, intermediate and mafic igneous rocks differ in their mineral composition. There are two types of felsic lava: rhyolite and dacite. There are also four types of volcanic rocks, which are types of extrusive igneous rocks. Intermediate magmas are somewhat more viscous than the mafic magmas. Intermediate compositions contain silica, iron, and magnesium in amounts that are intermediate to felsic and mafic compositions. Long Distance. Types of Basalt Mafic Magma Flood Pahoehoe Aa Pillow. If volcanic magma cools very quickly on the Earth's surface, obsidian glass is the result. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite.Common mafic rocks include basalt, diabase and gabbro.Mafic rocks often also contain calcium-rich varieties of plagioclase feldspar. composition that is intermediate between gabbro and granite Medium to coarse grained many samples of diorite display a 'salt-and-pepper' texture due to the near-equal mixture of light- … The term “felsic” refers to the high content of quartz laden feldspar minerals in the lava. 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. These minerals are high in magnesium and ferric oxides, and their presence gives mafic rock its characteristic dark colour. Felsic, intermediate, mafic and ultra mafic are the four broad types of magma. Occurrence of igneous rocks can be either intrusive (plutonic) or extrusive (volcanic). Learn term:magma igneous rocks = felsic and mafic with free interactive flashcards. A. Composition refers to a rock’s chemical and mineral make-up. A. Mafic--quiet and free flowing B. Mafic rocks are darker and are composed of magnesium and iron. Intermediate? Most of these rocks are gray though Mafic rocks are also found in brown, green, and even black colors. Short Distance. These low temperature lava flows have a high viscosity, which clogs the inner workings of volcanoes trapping and compounding gases. Intermediate rocks: Rocks composed mostly of hornblende and intermediate plagioclase feldspars make up the intermediate family of igneous rocks. The most common igneous compositions can be summarized in three words: mafic (basaltic), intermediate (andesitic), and felsic (granitic). 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