Ilinskite

General Information: Chemical Formula:NaCu5O2(SeO3)2Cl Composition:(Molecular Weight = 662.09 gm)Sodium 3.47 % NaCopper 47.99 % CuSelenium 23.85 % SeChlorine 5.35 % ClOxygen 19.33 % O  Empirical Formula: NaCu5O2(SeO3)2Cl Environment:From fumarolic exhalations. IMA Status:Approved IMA 1996 (Dana # Added) Locality:On the South and North breaks of the Tolbachik Main Fracture eruption, Kamchatka, Russia. Name Origin:For G. A. Ilinskiy (1927-1996) of St. Petersburg University.Physical Properties: Cleavage:[100] Perfect Color:emerald green. Density:4.08 Diaphaniety:Transparent Habits:Tabular - Form dimensions are thin in one direction., Euhedral Crystals - Occurs as well-formed crystals showing good external form., Hardness:1.5-2 - Talc-Gypsum Luminescence:Non-fluorescent. Luster:Vitreous - Adamantine Streak:light greenMore details...