Effenbergerite

General Information: Chemical Formula:BaCuSi4O10 Composition:(Molecular Weight = 473.21 gm)Barium 29.02 % BaCopper 13.43 % CuSilicon 23.74 % SiOxygen 33.81 % O  Empirical Formula: BaCuSi4O10 Environment:In a matrix consisting primarily of braunite, sugilite, and hausmannite, cut by pectolite veinlets. Ba-analog to cuprorivaite and Cu-analog to gillespite. IMA Status:Approved IMA Locality:Central-eastern orebody of the Wessels mine, Kalahari Manganese Field, NW Cape Province, Republic of South Africa. Name Origin:Named after Dr. Herta S. Effenberger, mineralogist and crystallograper of the University of Vienna.Physical Properties: Cleavage:[001] Perfect, [110] Poor Color:blue. Density:3.57 - 3.52, Average = 3.54 Diaphaniety:Transparent Habits:Platy - Sheet forms (e.g. micas)., , Hardness:4-5 - Fluorite-Apatite Luminescence:Non-fluorescent. Luster:Vitreous - Resinous Streak:pale blueMore details...