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Olmsteadite

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BCK207214

Olmsteadite

Type Locality

Description Tabs

Description
Locality: 
Big Chief Mine, Keystone, Glendale, Pennington County, South Dakota, United States of America
Size Range: 
Micromount (under 1cm)
Size: 
0.9 × 0.6 × 0.6 cm
Description

You are bidding on a small specimen with a group of partial crystals of the extremely rare niobium phosphate olmsteadite. Cavity born crystals of this mineral are very hard to find. Several faces are present in the vugs in siderite.

Mineral Data
What's on the rock

Olmsteadite

Formula: 
KFe2+2(Nb5+,Ta5+)(PO4)2O2·2H2O
Strunz: 
8.DJ.05
Hardness: 
4.0
Type Locality: 
Big Chief Mine (Johnson pegmatite), Glendale, Keystone District, Pennington Co., South Dakota, USA

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