Tenacity
Brittle
Brittle
Solubility
Poorly soluble in dilute HCl
-
Durability
-
-
Specific Gravity
2.80-2.952.45
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Perfect on {10 1 1}, rhombohedral cleavage
Perfect on {001}, good on {110}
Mohs Hardness
3.5-44-4.5
2
10
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Chemical Composition
CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)