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Povondraite
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| Mineral: | Povondraite: (Na,K)(Fe+++,Fe++)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 | ||||
| Comments: | Deep greenish black povondraite crystals. | ||||
| Location: | Malacacheta, Minas Gerais, Brazil. | ||||
| Scale: | See Photo. | ||||
| Copyright: | © Jeff Weissman / Photographic Guide to Mineral Species | ||||
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