Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.67-2.732.24-2.29
1
7.18
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Fracture
Conchoidal
Uneven, Subconchoidal, Conchoidal
Cleavage
Perfect on [10 1 1] three directions with angle of 74° 55
Very poor [100]
Mohs Hardness
35-5.5
2
10
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Chemical Composition
CaCO 3Ulrich Henn and Claudio C.
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references