Karpinskite

General Information: Chemical Formula:(Mg,Ni)2Si2O5(OH)2 (?) Composition:(Molecular Weight = 253.18 gm)Magnesium 9.60 % MgSilicon 22.19 % SiNickel 23.18 % NiHydrogen 0.80 % H Oxygen 44.24 % O  Empirical Formula: NiMgSi2O5(OH)2 Environment:An inadequately described mineral. Locality:Mizhne Tagilsk massif, Ural Mountains, Russia. Name Origin:Named for Alexander Petrovich Karpinsky (1846-1936), Russian geologist and president of the Russian Academy of Sciences.Physical Properties: Cleavage:[???] Perfect Color:colorless, greenish blue, or light blue. Density:2.53 - 2.63, Average = 2.58 Diaphaniety:Translucent Habits:Massive - Granular - Common texture observed in granite and other igneous rock., , Hardness:2.5-3 - Finger Nail-Calcite Luster:Greasy (Oily) Streak:whiteMore details...