1 Physical Properties
1.1 Tenacity
1.2 Solubility
Readily soluble in HF
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.86-2.942.55-2.63
1
7.18
1.5 Fracture
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Uneven, Uneven, Gems
1.6 Cleavage
None observed
{001} Perfect, {010} Good
1.7 Mohs Hardness
1.8 Chemical Composition
(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references
KAlSi 3O 8Arthur Thomas , Gemstones (2009)