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New page: thumb|300px'''Micas''' are a group of silicate minerals composed of varying amounts of potassium, magnesium, iron as well as aluminum, [[silicon]...
[[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>
==References==
<references/>
[[Category:Geology]]
==References==
<references/>
[[Category:Geology]]