Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.05-3.212.97
1
7.18
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Fracture
Uneven, Subconchoidal, Splintery
Uneven
Cleavage
Good on {110}, poor on {100}
None observed
Mohs Hardness
7.52.5
2
10
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Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Na 3AlF 6Ulrich Henn and Claudio C.