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Rösslerite

Type Locality
"Im Lochborn" Copper mine, Bieber, Gelnhausen, Spessart, Hesse, Germany
Mineral Data
Mg(HAsO4)·7H2O
Strunz: 
8.CE.20
Physical Properties
Crystal System: 
Monoclinic Fibrous crusts
Streak: 
White
Hardness: 
2.0 - 3.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Roesslerite and Rosslerite
Photos