Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.803.19-3.56
1
7.18
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Fracture
-
Uneven, Conchoidal
Cleavage
Perfect
{110} Perfect, {010} Indistinct
Mohs Hardness
5-6.55.5-6
2
10
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Chemical Composition
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)