Tenacity
-
-
Solubility
-
Partly soluble in HCl.
Durability
-
-
Specific Gravity
2.58-2.643.32-3.43
1
7.18
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Fracture
-
Conchoidal
Cleavage
Indiscernible
{100} perfect; {110} and {1 1 0} good; {010} poor
Mohs Hardness
6.5-75.5-6
2
10
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Chemical Composition
SiO2
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references