Tenacity
Brittle
Brittle
Solubility
-
Poorly soluble in dilute HCl
Durability
-
-
Specific Gravity
2.452.80-2.95
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Perfect on {001}, good on {110}
Perfect on {10 1 1}, rhombohedral cleavage
Mohs Hardness
4-4.53.5-4
2
10
👆🏻
Chemical Composition
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references