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[[Image:Mica.jpg|thumb|300px]]'''Micas''' are a group of [[silica]]te [[mineral]]s composed of varying amounts of [[potassium]], [[magnesium]], [[iron]] as well as [[aluminum]], [[silicon]] and [[water]].<ref>http://wrgis.wr.usgs.gov/docs/parks/rxmin/mineral.html#amphibole</ref>
[[Image:Mica.jpg|thumb|300px|Micas]]
'''Micas''' are a group of [[silica]]te [[mineral]]s composed of varying amounts of [[potassium]], [[magnesium]], [[iron]] as well as [[aluminum]], [[silicon]] and [[water]].<ref>http://wrgis.wr.usgs.gov/docs/parks/rxmin/mineral.html#amphibole</ref>
==References==
==References==