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Biotite
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| Mineral: | Biotite: K(Mg,Fe++)3[AlSi3O10(OH,F)2 | |||||
| Comments: | Sharp hexagonal plates of dark brown biotite to 2.5 cm. across, with white albite. | |||||
| Location: | Brazil. | |||||
| Scale: | 6.9x5.5x3 cm. | |||||
| Copyright: | © Richard Dale / Dale Minerals | |||||
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