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, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Conchoidal, Conchoidal, Brittle
1.6 Cleavage
111 (perfect in four directions)
Perfect on {001}, good on {110}
1.7 Mohs Hardness
1.8 Chemical Composition
C
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)