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