1 Physical Properties
1.1 Tenacity
1.3 Solubility
1.5 Durability
Not Available
Not Available
1.6 Specific Gravity
1.7 Fracture
Conchoidal, Conchoidal, Brittle
Brittle, Conchoidal
1.8 Cleavage
Perfect on {001}, good on {110}
Poor to indistinct on {010}
1.9 Mohs Hardness
1.12 Chemical Composition
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Not Available