Tenacity
Tough
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.78-2.852.98-3.10
1
7.18
👆🏻
Fracture
Uneven
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
Perfect basal (001)
[100] Perfect, [110] Good, [011] Distinct
Mohs Hardness
2-2.56
2
10
👆🏻
Chemical Composition
KMg3(Si3Al)O10(F,OH)2
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references