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Biotite
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| Mineral: | Biotite: K(Mg,Fe++)3[AlSi3O10(OH,F)2 | |||||
| Comments: | Brown book of pseudohexagonal biotite crystals in matrix. | |||||
| Location: | Sattleberg, Laacher See, Rhineland-Palatinate, Germany. | |||||
| Scale: | Size Not Given. | |||||
| Copyright: | © Lou Perloff / Photo Atlas of Minerals | |||||
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