Chromium mica ( muscovite var. Fuchsite Monoclinic)
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Chromium mica chemical composition: KAl 2 [Si 3 AlO 10 ] (OH, F) 2 , the ideal composition is octahedral sheet containing Al, but also a small amount of Fe 3+ , Mg, Fe 2+ or even Mn, Cr, Replacement by V, etc. Chromium mica has a highly complete bottom cleavage and a pale color. The characteristics of the sheet are elastic.
Chromium mica is one of the widely distributed rock-forming minerals, which is produced in all three types of rock types. The argillaceous rocks can form sericite during the metamorphism of low-grade areas. When the degree of metamorphism is slightly higher, it becomes muscovite; A large number of muscovite were formed in the late stage of crystallization and in the stage of pegmatite. The process of alteration from high temperature to medium and low temperature can also be generated;
Chromium mica oblique square column crystal: often plate-like or sheet-like, the shape is a pseudo-hexagon or diamond shape, and sometimes a single-conical columnar shape. 