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Baryte Psm Alstonite With Sphalerite

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PCZ222190

Baryte Psm Alstonite With Sphalerite

Description Tabs

Description
Locality: 
Nentsberry Haggs Mine, Alston Moor, Cumbria, United Kingdom
Class: 
Single Crystal
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 4 × 1 cm
Description

Numerous snow white baryte pseudomorphs after di-pyramidal alstonite on a thin crust of quartz matrix. A great example of a rare pseudo of a rare mineral. Also present are black sphalerite crystals which are mostly overgrown with micro quartz crystals.

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