Ellisite

General Information: Chemical Formula:Tl3AsS3 Composition:(Molecular Weight = 784.27 gm)Thallium 78.18 % TlArsenic 9.55 % AsSulfur 12.27 % S  Empirical Formula: Tl3AsS3 IMA Status:Approved IMA 1979 Locality:Carlin gold deposit, Eureka County, Nevada, USA. Name Origin:Named for Albert J. Ellis (1929-), New Zealand geochemist.Physical Properties: Cleavage:[1011] Perfect, [1011] Perfect, [1011] Perfect Color:dark gray. Density:7.1 Diaphaniety:Opaque Habits:Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals., , Hardness:2 - Gypsum Luster:Metallic Streak:pale brownMore details...