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Olmsteadite

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BCK585586

Olmsteadite

Type Locality

Description Tabs

Description
Locality: 
Big Chief Mine, Keystone, Glendale, Pennington County, South Dakota, United States of America
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1.9 × 1.7 × 1.2 cm
Description

You are bidding on a small sample with a large area of bright red, crystalline olmsteadite in siderite matrix from the type locality. One of the very few niobium phosphates and extremely rare. 

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

Seller Information

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