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Type Locality
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
Mineral Data
Mg(HAsO4)·4H2O
Strunz: 
8.CE.15
Physical Properties
Colour: 
White
Crystal System: 
Orthorhombic
Streak: 
White
Hardness: 
0.0
Tenacity: 
brittle
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