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Klyuchevskite

Type Locality
Great Fissure eruption (Main Fracture), Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia
Mineral Data
K3Cu3(Fe3+,Al)(SO4)4O2
Strunz: 
7.BC.45
Physical Properties
Colour: 
Green
Crystal System: 
Monoclinic
Hardness: 
3.5