1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
2.1 Durability
Not Available
Not Available
2.4 Specific Gravity
2.60-2.651.97-2.22
1
7.18
2.9 Fracture
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
2.10 Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Not Available
2.11 Mohs Hardness
2.18 Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2 + H 2OUlrich Henn and Claudio C.