Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.24-2.293.76-3.77
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
-
Cleavage
Very poor [100]
{110} Perfect, {110} Perfect
Mohs Hardness
5-5.55-6
2
10
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Chemical Composition
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.