1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
Brittle, Metallic, Brittle, Metallic
1.6 Cleavage
Distinct on {100}, poor on {110}; parting on {001}
{110} Perfect, {010} Perfect
1.7 Mohs Hardness
1.8 Chemical Composition
AlAl6O3BSi3O18
Na 2ZrSi 3O 9 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)