Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99992.9-3.5
1
7.18
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Fracture
-
Conchoidal
Cleavage
None
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
75.5-6
2
10
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Chemical Composition
70% SiO2, Al2O3, Na2O, K2O
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)