Information AboutFeldspar |
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| tectosilicates | |
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Feldspar is the name of an important group of rock-forming Mineral s which make up perhaps as much as 60% of the Earth 's Crust . Feldspars Crystal lize from Magma in both Intrusive and Extrusive rocks; they occur as compact minerals, as veins, and are also present in many types of Metamorphic Rock . Rock formed entirely of plagioclase feldspar (see below) is known as Anorthosite . Feldspars are also found in many types of Sedimentary Rock . Feldspar is derived from the German ''Feld'', field, and ''Spat'', a Rock that does not contain ore. Feldspathic refers to materials that contain feldspar. This group of minerals consists of framework or Tectosilicate s:
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