Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.454.27-4.35
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Perfect on {001}, good on {110}
{010} Distinct
Mohs Hardness
4-4.53-3.5
2
10
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Chemical Composition
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
BaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references