An igneous composed chiefly of one or more dark-colored minerals.
A 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. . 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 .[1] 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

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