Tenacity
-
-
Solubility
Decomposed by acids
insoluble
Durability
-
-
Specific Gravity
2.962.36
1
7.18
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Fracture
-
Uneven, Subconchoidal, Fibrous
Cleavage
Perfect on {010}
[110] perfect, [101] good, [010] distinct
Mohs Hardness
53.5-4
2
10
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Chemical Composition
(K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references