Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.98-3.102.00-2.45
1
7.18
👆🏻
Fracture
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Sub-Conchoidal, Conchoidal
Cleavage
[100] Perfect, [110] Good, [011] Distinct
none
Mohs Hardness
62-4
2
10
👆🏻
Chemical Composition
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Cu2H2Si2O5(OH)4