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
Uneven, Uneven, Gems
Conchoidal, Conchoidal, Brittle
1.6 Cleavage
{001} Perfect, {010} Good
Perfect on {001}, good on {110}
1.7 Mohs Hardness
1.8 Chemical Composition
KAlSi 3O 8Arthur Thomas , Gemstones (2009)
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)