Tenacity
-
Brittle
Solubility
Decomposed by acids
-
Durability
-
-
Specific Gravity
2.963.87-4.14
1
7.18
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Fracture
-
Subconchoidal, Conchoidal
Cleavage
Perfect on {010}
Poor on {120}, in traces on {001}
Mohs Hardness
55.5-6
2
10
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Chemical Composition
(K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references