Common occurrences of rock-forming garnets

Table
Common occurrences of rock-forming garnets
almandine metamorphic rocks—especially mica schists, amphibolites, and granulites; granites, aplites, and granitic pegmatites
spessartine granitic pegmatites; silica-rich skarns; metamorphosed manganese-bearing rocks
grossular impure calcite and dolomite marbles, especially those in contact metamorphic zones; amphibolites; basic igneous rocks
andradite large masses associated with tactites, some of which constitute ore deposits, in calcareous rocks of contact metasomatic origin
pyrope ultramafic rocks such as pyroxenites and peridotites and serpentinites derived from them; eclogites (high-pressure metamorphic rocks)
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Universalium. 2010.

Look at other dictionaries:

  • igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

  • metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… …   Universalium

  • garnet — garnetlike, adj. /gahr nit/, n. 1. any of a group of hard, vitreous minerals, silicates of calcium, magnesium, iron, or manganese with aluminum or iron, varying in color: a deep red transparent variety is used as a gem and as an abrasive. 2. a… …   Universalium

  • Garnet — /gahr nit/, n. Henry Highland, 1815 82, U.S. clergyman and abolitionist. * * * Any of a group of common silicate minerals with identical crystal structure but highly variable chemical composition. Garnets are most often found in metamorphic rocks …   Universalium

  • mica — micalike, adj. /muy keuh/, n. any member of a group of minerals, hydrous silicates of aluminum with other bases, chiefly potassium, magnesium, iron, and lithium, that separate readily into thin, tough, often transparent, and usually elastic… …   Universalium

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