1 Physical Properties
2.2 Tenacity
2.4 Solubility
Not Available
Readily soluble in HF
2.6 Durability
Not Available
Not Available
2.7 Specific Gravity
3.95-4.102.86-2.94
1
7.18
2.8 Fracture
Not Available
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
2.9 Cleavage
Not Available
None observed
2.10 Mohs Hardness
2.13 Chemical Composition
Al 2O 3Ulrich Henn and Claudio C.
(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references