Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.98-3.102.9-3.5
1
7.18
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Fracture
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Conchoidal
Cleavage
[100] Perfect, [110] Good, [011] Distinct
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
65.5-6
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
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)