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anorthosite |
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anorthositeType of igneous rock composed predominantly of calcium-rich feldspar. It is considerably less abundant than either basalt or granite, but the complexes in which it occurs are often immense. All anorthosites found on the earth consist of coarse crystals, but some from the moon are finely crystalline. anorthosite [ə′nȯr·thə‚sīt] (petrology) A visibly crystalline plutonic rock composed almost entirely of plagioclase feldspar (andesine to anorthite) with minor amounts of pyroxene and olivine. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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His company plans to extract 150,000 tons of anorthosite a year from a trio of parcels spanning five acres in a total claim of 320 acres within the Angeles National Forest. Small and isolated intrusions of diorite, gabbro, gabbronorite, ultramafic rocks, monzonite, syenite and anorthosite constitute about 2% of the area. The use of this technology has been assessed with two minerals, anorthosite (a calcium alumino-silicate) and jotunite (an iron-rich basalt). |
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