- ALASKA VOLCANO OBSERVATORY GLOSSARY
An igneous composed chiefly of one or more dark-colored minerals.\GLOSSARY OF VOLCANIC TERMSA compositional term for igneous rocks which contain 45%-55% SiO2 (by weight). Mafic rocks are generally dark colored, and are characterized by mineralogy including pyroxene and calcium-rich plagioclase, variable amounts of olivine, and accessory minerals such as ilmenite and magnetite. Examples of mafic rocks include basalt and gabbro.
Glossary of volcanic terms. - University of Wisconsin Oshkosh. G. J. Hudak. 2001.
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Mafic — is an adjective describing a silicate mineral or rock that is rich in magnesium and iron; the term is a portmanteau of the words magnesium and ferric . Most mafic minerals are dark in color and the relative density is greater than 3. Common… … Wikipedia
mafic — [maf′ik] adj. [ MA(GNESIUM) + L f(errum), iron + IC] Geol. of or pertaining to igneous rocks that are rich in dark colored minerals and that contain magnesium and iron and a comparatively low level of silica … English World dictionary
mafic — adjective Etymology: New Latin magnesium + Latin ferrum iron + English ic Date: 1912 of, relating to, or being a group of usually dark colored minerals rich in magnesium and iron … New Collegiate Dictionary
mafic — /maf ik/, adj. Geol. of or pertaining to rocks rich in dark, ferromagnesian minerals. Cf. basic (def. 4), ultramafic. [1910 15; MA(GNESIUM) + L f(errum) iron + IC] * * * … Universalium
mafic — adjective Describing rocks, such as silicate minerals, magmas, and volcanic and intrusive igneous rocks, which contain relatively high concentrations of heavier elements … Wiktionary
mafic — [ mafɪk] adjective Geology relating to or denoting a group of dark coloured, mainly ferromagnesian minerals such as pyroxene and olivine. Often contrasted with felsic. Origin early 20th cent.: blend of magnesium and ferric … English new terms dictionary
mafic — maf·ic … English syllables
mafic — maf•ic [[t]ˈmæf ɪk[/t]] adj. pet gel of or pertaining to rocks rich in dark, ferromagnesian minerals • Etymology: 1910–15; ma(gnesium)+ L f(errum) iron + ic … From formal English to slang
mafic — /ˈmæfɪk/ (say mafik) adjective of some igneous rocks and their constituent minerals, composed dominantly of the magnesium rock forming silicates. Compare felsic … Australian English dictionary
mafic — ˈmafik adjective Etymology: magnesium + Latin ferrum + English ic more at farrier : of or relating to a group of minerals characterized by magnesium and iron and usually by their dark color … Useful english dictionary