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Johnwalkite
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| Mineral: | Johnwalkite: K(Mn++,Fe+++,Fe++)2(Nb,Ta)(PO4)2O2((H2O),OH)2 | ||||
| Comments: | Fragment of translucent johnwalkite. | ||||
| Location: | Champion Mine, Keystone District, Pennington Co., South Dakota, USA. | ||||
| Scale: | Crystal length 1 mm. | ||||
| Copyright: | © Jeff Weissman / Photographic Guide to Mineral Species | ||||
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