Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.45-2.502.45
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Poor on {110}
Perfect on {001}, good on {110}
Mohs Hardness
5.5-64-4.5
2
10
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Chemical Composition
KAlSi 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)