Kelyanite

General Information: Chemical Formula:Hg+16Hg++20Sb3(Cl,Br)9O28 Composition:(Molecular Weight = 8,398.00 gm)Mercury 85.99 % HgAntimony 4.35 % SbBromine 0.95 % BrChlorine 3.38 % ClOxygen 5.33 % O  Empirical Formula: Hg16Hg20Sb3Cl8BrO28 Environment:Oxidation zone of stibnite-cinnabar ores. IMA Status:Approved IMA 1982 Locality:Kelyan deposit, Buryatia, Ural Mountains, Russia. Name Origin:Named for the locality.Physical Properties: Cleavage:None Color:brown or reddish brown. Density:8.51 - 8.63, Average = 8.57 Diaphaniety:Nearly opaque Habits:Granular - Generally occurs as anhedral to subhedral crystals in matrix., , Streak:reddish brownMore details...