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Baryte Psm Alstonite With Sphalerite

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PCZ199459

Baryte Psm Alstonite With Sphalerite

Description Tabs

Description
Locality: 
Nentsberry Haggs Mine, Alston Moor, Cumbria, United Kingdom
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2.5 × 2.5 cm
Description

Hi All, this auction is part of a series of ‘Clear-out Minerals’ Clear-out auctions. This specimen and the majority of others on offer this have a starting price 50% or more lower than in all previous auctions. Happy bidding. Di-pyramidal alstonite crystals have been replaced by white barite preserving the form of the originals. They are scattered among lustrous black sphalerite on limestone matrix. An attractive and very rare pseudomorph of a rare mineral.

Mineral Data
What's on the rock

Baryte

Formula: 
BaSO4
Strunz: 
7.AD.35
Hardness: 
3.0 - 3.5
Streak: 
White

Alstonite

Formula: 
BaCa(CO3)2
Strunz: 
5.AB.35
Crystal System: 
Triclinic
Hardness: 
4.0 - 4.5
Streak: 
White
Type Locality: 
Brownley Hill Mine (Bloomsberry Horse Level), Nenthead, Alston Moor District, North Pennines, North and Western Region (Cumberland), Cumbria, England, UK

Sphalerite

Formula: 
ZnS
Strunz: 
2.CB.05a
Crystal System: 
Isometric
Hardness: 
3.5 - 4.0
Peter Crozier Minerals