1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)
Conchoidal, Conchoidal, Brittle
1.6 Cleavage
Indiscernible
Perfect on {001}, good on {110}
1.7 Mohs Hardness
1.8 Chemical Composition
SiO2
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)