Feldspar | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-05

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Feldspar


00:00:32 1 Etymology
00:01:07 2 Compositions
00:02:07 2.1 Alkali feldspars
00:03:27 2.2 Barium feldspars
00:04:00 2.3 Plagioclase feldspars
00:05:36 3 Weathering
00:05:52 4 Production and uses
00:07:45 5 Images
00:07:54 6 See also



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SUMMARY
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Feldspars (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8) are a group of rock-forming tectosilicate minerals that make up about 41% of the Earth's continental crust by weight.Feldspars crystallize from magma as veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Rock formed almost entirely of calcic plagioclase feldspar is known as anorthosite. Feldspars are also found in many types of sedimentary rocks.