Physical Properties
Tenacity
-
-
Solubility
Decomposed by acids
-
Durability
-
-
Specific Gravity
2.966.30-6.39
1
7.18
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Fracture
-
Conchoidal
Cleavage
Perfect on {010}
[001] good, [210] distinct
Mohs Hardness
53-3.5
2
10
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Chemical Composition
(K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references