Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.652.81
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
{001} Perfect
Mohs Hardness
6-6.54.5-5
2
10
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Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
NaAl 3(PO 4) 2(OH) 4 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references