Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.803.05-3.08
1
7.18
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Fracture
-
Uneven, Irregular, Conchoidal
Cleavage
Perfect
None
Mohs Hardness
5-6.56.5
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 3Al 2(SiO 4) 3-x(OH) 4x (x=0.2 to 1.5)Anthony et al , Handbook of mineralogy (2001)