Fernandinite

General Information: Chemical Formula:CaV8O20·4(H2O) Composition:(Molecular Weight = 839.66 gm)Calcium 4.77 % CaVanadium 48.54 % V Hydrogen 0.96 % H Oxygen 45.73 % O  Empirical Formula: CaV5+8O20·4(H2O) Locality:Minasragra, Peru. Name Origin:Named for Eulagio E. Fernanadini, former owner of the Minasragra deposit.Physical Properties: Cleavage:[???] Perfect Color:dark green. Density:2.78 Habits:Massive - Uniformly indistinguishable crystals forming large masses., Foliated - Two dimensional platy forms., Hardness:2-3 - Gypsum-Calcite Luster:Sub Metallic Streak:dark greenMore details...