Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.522.6-3.3
1
7.18
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Fracture
-
Lamellar
Cleavage
{100} Perfect, {001} Perfect
Perfect 001
Mohs Hardness
5-5.52-2.5
2
10
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Chemical Composition
Na(Mn2+ ,Ca) 2Si 3O 8(OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6