Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.25-2.403.65-4.55
1
7.18
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Fracture
-
Conchoidal
Cleavage
perfect on {010}; good on {100}
None, but may exhibit slight parting
Mohs Hardness
5-5.57.5-8
2
10
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Chemical Composition
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)