Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.093.19-3.56
1
7.18
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Fracture
Uneven
Uneven, Conchoidal
Cleavage
Perfect on {100} and {010}, imperfect on {101}
{110} Perfect, {010} Indistinct
Mohs Hardness
85.5-6
2
10
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Chemical Composition
CaAl2Si2O7(OH)2.H2O
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)