Tenacity
Brittle
-
Solubility
Poorly soluble in dilute HCl
-
Durability
-
-
Specific Gravity
2.80-2.952.71-2.72
1
7.18
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Fracture
Conchoidal
Fibrous
Cleavage
Perfect on {10 1 1}, rhombohedral cleavage
{???} Good
Mohs Hardness
3.5-46-6.5
2
10
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Chemical Composition
CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 6Si 6O 17(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)