Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.3-3.53.19-3.56
1
7.18
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Fracture
Uneven
Uneven, Conchoidal
Cleavage
Perfect on [110]
{110} Perfect, {010} Indistinct
Mohs Hardness
5-65.5-6
2
10
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Chemical Composition
NaNa2(Fe++4Fe+++)Si8O22(OH)2
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)