Alumoklyuchevskite

General Information: Chemical Formula:K3Cu3AlO2(SO4)4 Composition:(Molecular Weight = 751.17 gm)Potassium 15.62 % K Aluminum 3.59 % AlCopper 25.38 % CuSulfur 17.08 % S Oxygen 38.34 % O  Empirical Formula: K3Cu3AlO2(SO4)4 Environment:A volcanic exhalation. IMA Status:Approved IMA 1995 Locality:The second cone of the Northern Breakthrough of the Main Tolbachik fracture eruption, Kamchatka, Russia. Name Origin:It is the aluminum dominant analog of klyuchevskite.Physical Properties: Cleavage:[001] Perfect Color:dark green. Density:3.1 Diaphaniety:Transparent Habits:Acicular - Occurs as needle-like crystals., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Hardness:2 - Gypsum Luster:Vitreous (Glassy) Streak:light greenMore details...