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