Biotite

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Biotite K(Mg,Fe2+ +3 )(Al,Fe3+ )Si3O10(OH,F)2 Marquette Co., Michigan

Biotite K(Mg,Fe2+ +3 )(Al,Fe3+ )Si3O10(OH,F)2 Marquette Co., Michigan

Biotite K(Mg,Fe2+ +3 )(Al,Fe3+ )Si3O10(OH,F)2 Marquette Co., Michigan

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