Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-3.022.98-3.10
1
7.18
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Fracture
-
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
Perfect
[100] Perfect, [110] Good, [011] Distinct
Mohs Hardness
-99996
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references