Cavansite

General Information: Chemical Formula:Ca(VO)Si4O10·4(H2O) Composition:(Molecular Weight = 451.42 gm)Calcium 8.88 % CaVanadium 11.28 % V Silicon 24.89 % SiHydrogen 1.79 % H Oxygen 53.16 % O  Empirical Formula: CaV4+Si4O11·4(H2O) Environment:Secondary mineralization in basalts and andesites. IMA Status:Approved IMA 1967 Locality:Deccan trap basalts, Poona, India. Name Origin:Named after its composition of calcium, vanadium, and silicon.Physical Properties: Cleavage:[010] Good Color:greenish blue or dark blue. Density:2.21 - 2.31, Average = 2.25 Diaphaniety:Subtransparent Hardness:3-4 - Calcite-Fluorite Luster:Vitreous (Glassy) Streak:bluish whiteMore details...