Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.98-3.103.32-3.43
1
7.18
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Fracture
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Conchoidal
Cleavage
[100] Perfect, [110] Good, [011] Distinct
Poor on {110} and {100} very poor on {001}
Mohs Hardness
66-7
2
10
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Chemical Composition
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4