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Olmsteadite

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BCK501941

Olmsteadite

Type Locality

Description Tabs

Description
Locality: 
Big Chief Mine, Keystone, Glendale, Pennington County, South Dakota, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 0.9 × 0.5 cm
Description

You are bidding on a very good specimen of olmsteadite with a nice, elongate tabular olmsteadite crystal in a vug that has been partially filled in with messelite. The crystal shows quite a few sharp faces and is partially terminated. The last and probably best sample of this mineral I have!

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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