Goldmanite

General Information: Chemical Formula:Ca3(V,Al,Fe+++)2(SiO4)3 Composition:(Molecular Weight = 484.97 gm)Calcium 24.79 % CaAluminum 3.34 % AlVanadium 12.60 % V Iron 2.30 % FeSilicon 17.37 % SiOxygen 39.59 % O  Empirical Formula: Ca3V3+1.2Al0.6Fe3+0.2(SiO4)3 Environment:Vanadium rich clay found in a metamorphosed uranium-vanadium deposit. IMA Status:Approved IMA 1964 Locality:Unnamed prospect pit in the Sandy or South Laguna Mine, Laguna uranium district, Valencia county, New Mexico. Name Origin:The name honors Macus I. Goldman, a sedimentary petrologist with the U. S. Geological Survey.Physical Properties: Cleavage:None Color:dark green or brownish green. Density:3.74 Diaphaniety:Transparent to Subopaque Habits:Crystalline - Fine - Occurs as well-formed fine sized crystals., , Hardness:6-7 - Orthoclase-Quartz Luster:Vitreous (Glassy) Streak:whiteMore details...

Ca3(V,Al,Fe)2(SiO4)3