Tenacity
-
-
Solubility
Partly soluble in HCl.
-
Durability
-
-
Specific Gravity
3.32-3.432.50-2.80
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
{100} perfect; {110} and {1 1 0} good; {010} poor
Perfect
Mohs Hardness
5.5-65-6.5
2
10
👆🏻
Chemical Composition
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)