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Johnwalkite Image

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 Johnwalkite

Large Johnwalkite Image

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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