Color: Blue, Green Category: Phosphate minerals Formula: CuAl6(PO4)4(OH)8·4H2O Hardness: 5 – 6 Density: 2.6-2.8, average 2.7 Crystal: Triclinic Luster: Waxy Treatment: None Origin: This material can be found in many locations around the world. The stones in the picture are from Armenia.