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Alstonite

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PCZ183716

Alstonite

Type Locality

Description Tabs

Description
Locality: 
Fallowfield Mine, Acomb, Northumberland, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 3 × 2.5 cm
Description

Numerous sharp scalenohedral crystals (hard to photograph) of alstonite to 5-6mm on matrix. Fallowfield Mine is the co-type locality for this rare barium calcium carbonate mineral. Why not collect the TL set as the second alstonite I have listed is from the other co-type locality.

Mineral Data
What's on the rock

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
Peter Crozier Minerals