Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.522.34-2.51
1
7.18
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Fracture
-
-
Cleavage
{100} Perfect, {001} Perfect
None
Mohs Hardness
5-5.5-9999
2
10
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Chemical Composition
Na(Mn2+ ,Ca) 2Si 3O 8(OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O