Sanbornite

General Information: Chemical Formula:BaSi2O5 Composition:(Molecular Weight = 273.50 gm)Barium 50.21 % BaSilicon 20.54 % SiOxygen 29.25 % O  Empirical Formula: Ba(Si2O5) Environment:beta-BaSi2O5 is a high temperature phase. Major component of Ba-silicate assemblages at or near fringes of large granite intrusives. Locality:Incline sanbornite deposit, Truball Peak, 4 miles WNW of Incline, Mariposa Co, California. Name Origin:Named for Frank B. Sanborn, (1862-1936), Mineralogist, California Department of Natural Resources.Physical Properties: Cleavage:[???] Perfect Color:colorless or white. Density:3.74 Diaphaniety:Transparent to Translucent Habits:Platy - Sheet forms (e.g. micas)., , Hardness:5 - Apatite Luster:Vitreous (Glassy) Streak:whiteMore details...