Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.25-2.403.76-3.77
1
7.18
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Fracture
-
-
Cleavage
perfect on {010}; good on {100}
{110} Perfect, {110} Perfect
Mohs Hardness
5-5.55-6
2
10
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Chemical Composition
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.