Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3-3.153.16-3.23
1
7.18
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Fracture
Conchoidal
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
Good on [110] and on [001]
[0001] indistinct, [1010] indistinct
Mohs Hardness
6.0-6.55
2
10
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Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references