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Avdoninite

Type Locality
Yadovitaya fumarole, Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia
Mineral Data
K2Cu5(OH)4Cl8·H2O
Strunz: 
3.DA.55
Physical Properties
Colour: 
Green
Hardness: 
3.0
Tenacity: 
brittle