Physical Properties
Tenacity
-
-
Solubility
Decomposed by acids
-
Durability
-
-
Specific Gravity
2.962.98-3.10
1
7.18
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Fracture
-
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
Perfect on {010}
[100] Perfect, [110] Good, [011] Distinct
Mohs Hardness
56
2
10
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Chemical Composition
(K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references