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BookmarkFeldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust.
Feldspars crystallize from magma in both intrusive and extrusive rocks, and they can also occur as compact minerals, as veins, and are also present in many types of metamorphic rock.
Rock formed entirely of plagioclase feldspar is known as anorthosite..
For more information about the topic Feldspar mineral, read the full article at Wikipedia.org, or see the following related articles:
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Igneous rock — Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive ... > read more
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Basalt rock — Basalt is a common gray to black volcanic rock. It is usually fine-grained due to rapid cooling of lava on the Earth's surface. It may be porphyritic ... > read moreNote: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Feldspar mineral at Wikipedia.org. See the Wikipedia copyright page for more details.
