Falcondoite

General Information: Chemical Formula:(Ni,Mg)4Si6O15(OH)2·6(H2O) Composition:(Molecular Weight = 750.99 gm)Magnesium 3.24 % MgSilicon 22.44 % SiNickel 23.45 % NiHydrogen 1.88 % H Oxygen 49.00 % O  Empirical Formula: Ni3MgSi6O15(OH)2·6(H2O) IMA Status:Approved IMA 1976Physical Properties: Color:green or yellowish green. Density:2.41 Diaphaniety:Translucent to Subopaque Habits:Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite)., , Hardness:3-4 - Calcite-Fluorite Luminescence:Non-fluorescent. Luster:Resinous Streak:whiteMore details...

(Ni,Mg)3Si6O15(OH)2 6(H2O)