Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.2-3.42.98-3.10
1
7.18
👆🏻
Fracture
Uneven
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
Perfect on [001] imperfect on [100]
[100] Perfect, [110] Good, [011] Distinct
Mohs Hardness
36
2
10
👆🏻
Chemical Composition
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references