Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.652.98-3.10
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
3,1
[100] Perfect, [110] Good, [011] Distinct
Mohs Hardness
76
2
10
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Chemical Composition
SiO 2Ulrich Henn and Claudio C.
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references