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Therefore, rocks are divided into ultramafic, mafic, intermediate, and felsic. Definitions Gabbro is an example of a mafic rock. In geology, mafic is a term which describes an igneous rock or a silicate mineral rich in iron and magnesium. FELDSPAR. felsic rock, highest content of silicon, with predominance of quartz, alkali feldspar and/or feldspathoids: the felsic minerals; these rocks (e.G., granite, rhyolite) are usually light coloured, and feature low density. Granite is made of four minerals, all visible to the naked eye: feldspar (white), quartz (translucent), hornblende (black), and biotite (black, platy). Perhaps you meant to contrast felsic rocks with mafic rocks. 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. Mafic has low levels of silica. The composition depends on the minerals the rock includes. Felsic minerals are typically light in color (commonly clear, white, or pink) and rich in lighter elements, like silicon, oxygen, aluminum, sodium, and potassium. The table includes examples of minerals. Felsic. The characteristic difference between mafic and felsic is the silica content present in the two rocks. This is an order showing increased silica content. Mafic rocks have between 45 and 55% of silica, whereas felsic rocks have over 65% of silica, the highest of all types. Mineralogic contents – felsic versus mafic. Felsic rocks are generally rich in silicon and aluminum and contain only small amounts of magnesium and iron. The composition can be felsic, intermediate, mafic, or ultramafic. It is a glassy-textured, extrusive igneous rock. Basalt, one of the common examples of Mafic rock has only 50% silica content. FELSIC MINERAL. Approximately only 45-55%. "Felsic" and "igneous" are overlapping categories: granite and rhyolite are examples of felsic igneous rocks. the minerals feldspar and quartz or an igneous or metamorphic rock made predominantly of felspar and quartz. Examples of extrusive igneous rocks include basalt, andesite, rhyolite, dacite, obsidian, pumice and scoria. Obsidian is a natural glass - it lacks crystals, and therefore lacks minerals. Contrast w/ mafic. On the other hand, Felsic has much higher levels of … A felsic rock will contain felsic minerals. Komatiite is a … None. Due to the color of the minerals … A term used to describe an igneous rock that has a large percentage of light-colored minerals such as quartz, feldspar, and muscovite. The mineral compositions are listed in Table below. An extrusive igneous rocks definition states these rocks form when magma "exits and cools above (or very near) the Earth's surface." Also used in reference to the magmas from which these rocks crystallize. 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