Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.396-3.4432.45
1
7.18
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Fracture
-
Conchoidal
Cleavage
[001] good, [100] and [110] fair
Perfect on {001}, good on {110}
Mohs Hardness
3-44-4.5
2
10
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Chemical Composition
Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)