Alvanite

General Information: Chemical Formula:(Zn,Ni)Al4(VO3)2(OH)12·2(H2O) Empirical Formula: Zn0.75Ni0.25Al4(VO3)2(OH)12·2(H2O) IMA Status:Approved IMA 1959Physical Properties: Cleavage:[010] Perfect Color:bluish green, blue black, or black. Density:2.41 - 2.49, Average = 2.45 Hardness:3-3.5 - Calcite-Copper Penny Luster:Vitreous (Glassy) Streak:grayMore details...

(Zn,Ni)Al4(VO3)2(OH)12 2(H2O)