Tenacity
-
-
Solubility
Partly soluble in HCl.
-
Durability
-
-
Specific Gravity
3.32-3.433.31
1
7.18
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Fracture
Conchoidal
-
Cleavage
{100} perfect; {110} and {1 1 0} good; {010} poor
Indiscernible
Mohs Hardness
5.5-6-9999
2
10
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Chemical Composition
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
NaFe 3+ 3 Al 6 (BO 3 ) 3 Si 6 O 18 (O,F,OH) 4 Anthony et al, Handbook of mineralogy (2001)