Mongolite

General Information: Chemical Formula:Ca4Nb6Si5O24(OH)10·5(H2O) Composition:(Molecular Weight = 1,332.24 gm)Calcium 12.03 % CaNiobium 41.84 % NbSilicon 10.54 % SiHydrogen 0.76 % H Oxygen 34.83 % O  Empirical Formula: Ca4Nb6Si5O24·5(H2O) Environment:Agpaitic pegmatites in alkalic granite. IMA Status:Approved IMA Locality:Khan-Bogdinsky massif, Gobi desert, Mongolia, China. Name Origin:Named after the locality.Physical Properties: Cleavage:[001] Good Color:gray lilac or light violet. Density:3.147 - 3.15, Average = 3.14 Diaphaniety:Transparent Habits:Microscopic Crystals - Crystals visible only with microscopes., Foliated - Two dimensional platy forms., Hardness:2 - Gypsum Luster:Silky Streak:whiteMore details...

Ca4Nb6Si5O24(OH)10 5-6(H2O)