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Baryte Psm Alstonite With Sphalerite

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SUR32133

Baryte Psm Alstonite With Sphalerite

Ex Scott J Williams, L& P Greenbank

Description Tabs

Description
Locality: 
Nentsberry Haggs Mine, Alston Moor, Cumbria, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 4 × 2 cm
Description

Nice distinct pseudomorphs of barite after alstonite, overlaying quartz, galena and lustrous sphalerite crystals (some of which are gemmy brown ones).

Great contrast and good condition.

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
Surrey Minerals