Tenacity
-
-
Solubility
Partly soluble in HCl.
-
Durability
-
-
Specific Gravity
3.32-3.432.9-3.5
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
{100} perfect; {110} and {1 1 0} good; {010} poor
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
5.5-65.5-6
2
10
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Chemical Composition
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)