Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.24-2.29-9999
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
Conchoidal
Cleavage
Very poor [100]
None
Mohs Hardness
5-5.57-7.5
2
10
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Chemical Composition
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.