Aerugite

General Information: Chemical Formula:([ ],Ni)9(AsO4)2(AsO6) (?) Composition:(Molecular Weight = 976.97 gm)Nickel 54.07 % NiArsenic 23.01 % AsOxygen 22.93 % O  Empirical Formula: Ni9As3O14 Environment:Found in the walls of furnaces used to roast ore. IMA Status:Approved IMA 1965 Locality:TL: South Terres mine, St Austell, Cornwall, England. Name Origin:Named from the Greek for 'copper rust', in allusion to its appearance.Physical Properties: Color:deep blue green or green. Density:5.85 - 5.95, Average = 5.9 Diaphaniety:Opaque Habits:Massive - Uniformly indistinguishable crystals forming large masses., Euhedral Crystals - Occurs as well-formed crystals showing good external form., Encrustations - Forms crust-like aggregates on matrix. Hardness:4 - Fluorite Streak:greenish whiteMore details...