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Alstonite

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