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Urusovite

Type Locality
Novaya fumarole, Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia
Mineral Data
CuAl(AsO4)O
Strunz: 
8.BB.60
Physical Properties
Crystal System: 
Monoclinic
Streak: 
White
Hardness: 
4.0