Aenigmatite

General Information: Chemical Formula:Na2Fe++5TiSi6O20 Composition:(Molecular Weight = 861.60 gm)Sodium 5.34 % NaTitanium 5.56 % TiIron 32.41 % FeSilicon 19.56 % SiOxygen 37.14 % O  Empirical Formula: Na2Fe2+5TiSi6O20 Environment:Sodalite-syenite rocks. IMA Status:Approved IMA 1963 Locality:TL: Julianehaab district in southern Greenland.Physical Properties: Cleavage:[???] Perfect Color:brown or black. Density:3.74 - 3.85, Average = 3.79 Diaphaniety:Opaque Habits:Lamellar - Thin laminae producing a lamellar structure., , Hardness:5-6 - Between Apatite and Orthoclase Luminescence:Non-fluorescent. Luster:Subadamantine Streak:reddish brownMore details...