Phyllosilicates

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Biotite #2 PPL

Biotite thin section

For Jean Baptiste Biot (1774-1862), French physicist, who studied the optical differences between the micas. Formula: K(Mg,Fe)3(AlSi3O10)(F,OH)2 System: Monoclinic Color: Brown, gray, green, yellow, or reddish brown Lustre:...