Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.902.25-2.40
1
7.18
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Fracture
Conchoidal
-
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
perfect on {010}; good on {100}
Mohs Hardness
45-5.5
2
10
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Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references