Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.69-2.722.98-3.10
1
7.18
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Fracture
Uneven, Conchoidal
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
[100] Perfect, [110] Good, [011] Distinct
Mohs Hardness
6-6.56
2
10
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Chemical Composition
(Na,Ca)1-2Si3-2O8
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references