Barytolamprophyllite

General Information: Chemical Formula:Ba2Na3(Fe+++,Ti)3(Si2O7)2(O,OH,F)4 Composition:(Molecular Weight = 905.03 gm)Barium 30.35 % BaSodium 7.62 % NaTitanium 5.29 % TiIron 12.34 % FeSilicon 12.41 % SiHydrogen 0.08 % H Oxygen 31.38 % O Fluorine 0.52 % F  Empirical Formula: Ba2Na3Fe3+2TiSi2O72O3(OH)0.75(F)0.25 Environment:Alkalic rocks. IMA Status:Approved IMA 1966 Locality:Lovozero massif, Khibiny, Kola, Peninsula, Russia. Name Origin:Named for the composition and similarity to lamprophyllite.Physical Properties: Cleavage:[100] Perfect, [011] Good, [010] Poor Color:golden brown or dark brown. Density:3.62 - 3.66, Average = 3.64 Diaphaniety:Translucent Habits:Flakes - Flat, thin crystals or aggregates., Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point., Hardness:2-3 - Gypsum-Calcite Luster:Vitreous (Glassy) Streak:light brownMore details...

(Na,K)2(Ba,Ca,Sr)2(Ti,Fe)3(SiO4)4(O,OH)2