2 Physical Properties
2.2 Tenacity
2.3 Solubility
Not Available
Not Available
1.2 Durability
Not Available
Not Available
1.3 Specific Gravity
2.60-2.651.98-2.50
1
7.18
1.10 Fracture
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
Conchoidal, Conchoidal, Gemstones of the world (2001)
1.11 Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Not Available
1.12 Mohs Hardness
1.13 Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)