Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-3.023.18-3.37
1
7.18
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Fracture
-
Conchoidal
Cleavage
Perfect
Perfect on 210
Mohs Hardness
-99995.5-6
2
10
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Chemical Composition
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
Na(Fe,Mg)7(AlSi7O22)(OH)2