Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.653.16-3.23
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
[0001] indistinct, [1010] indistinct
Mohs Hardness
6-6.55
2
10
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Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references