Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.25-2.405.50-5.90
1
7.18
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Fracture
-
Conchoidal
Cleavage
perfect on {010}; good on {100}
On {10 1 0}, perfect; parting on {000 1 }
Mohs Hardness
5-5.54
2
10
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Chemical Composition
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)