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, Conchoidal, Brittle
Splintery, UnevenArthur Thomas, Difficult, Fibrous
1.6 Cleavage
Perfect on {001}, good on {110}
Good on [110]
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)
NaAlSi 2O 6Ulrich Henn and Claudio C.