Tenacity
-
Brittle
Solubility
Partly soluble in HCl.
Soluble
Durability
-
-
Specific Gravity
3.32-3.433.25-3.35
1
7.18
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Fracture
Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
{100} perfect; {110} and {1 1 0} good; {010} poor
Perfect in three directions
Mohs Hardness
5.5-65
2
10
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Chemical Composition
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references