If a rock is dark-colored, or mafic, it contains iron and magnesium. Mafic rocks are abundant in … Silica content in Mafic rocks is around 50% by weight. 1/23/2017 Igneous Rocks Flashcards | Quizlet 1/5 25 terms LieselMorgan Igneous Rocks What is the difference between intrusive and extrusive igneous rocks? GABBRO - phaneritic (large crystals) of mafic minerals: olivine, pyroxene, etc. On the basis of the texture , grain size is considered. Your logic is correct when looking at mineral stability in the face of chemical weathering. Definitions Gabbro is an example of a mafic rock. The most common examples of rocks classified as Mafic are gabbro, dolerite, and basalt. 4.Ultramafic igneous rock: igneous rocks with the lowest content of silica and the highest content of mafic minerals like dunite and komatiite. (T/F) Mafic igneous rocks are silica-poor. Intrusive: formed below ground, e.g: Granite Extrusive: formed above ground, e.g: Basalt Give an example of a coarse and a fine grained igneous rock? Mafic is a term used to describe both minerals that are rich in iron and magnesium and rocks that are rich in those minerals. The word Mafic comes from (ma) for magnesium and (f) for ferrum or the Latin for iron. basalt. Rhyolite contains more silicate minerals because it has a felsic mineral content while gabbro has a mafic mineral content. Mafic rocks (basalt and gabbro) are very dark in color and very dense because of their high iron content. Cram.com makes it easy to get the grade you want! Study Flashcards On Geology Exam 1 - Minerals & Igneous Rocks at Cram.com. Quickly memorize the terms, phrases and much more. In geology, mafic is a term which describes an igneous rock or a silicate mineral rich in iron and magnesium. Mafic rocks are dark in color. Basic: rocks that are about 45 to 55% silica (mostly mafic minerals plus plagioclase feldspar and/or feldspathoid minerals), e.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. Mafic: Felsic: Definition: It is relating to, denoting, or containing a group of dark-colored, mainly ferromagnetic minerals such as pyroxene and olivine. Felsic. If a rock is light colored or felsic, it contains silicate minerals. Silica (SiO2) content also controls the minerals that crystallise and is used to further classify igneous rocks as follows: Acid: rocks with above 63% silica (mostly feldspar minerals and quartz), e.g. Most of these rocks are gray though Mafic rocks are also found in brown, green, and even black colors. BASALT - aphanitic (small crystals) of mafic minerals: olivene, pyroxene, etc. True (T/F) A mineral's melting point generally increases with increasing pressure. True (T/F) A pluton is an igneous structure that crystallized at very shallow depths. Therefore, the minerals at the cooler end are also more dominated by covalent bonds over ionic bonds. 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. List an example for each? Felsic and mafic rocks, division of igneous rocks on the basis of their silica content. The mineral composition can be … granite. The term mafic is a combination of the words “magnesium” and “ferric.” The majority of mafic minerals are dark green or greenish black and are medium to coarse-grained. 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