Tenacity
-
Brittle
Solubility
Soluble
Soluble
Durability
-
-
Specific Gravity
2.30-2.903.30-3.50
1
7.18
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Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Good to perfect_usually N/A
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
5-65
2
10
👆🏻
Chemical Composition
CuAl6(PO4)4(OH)8 • 4H2O
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references