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
2.24-2.293.65-4.55
1
7.18
1.5 Fracture
Uneven, Subconchoidal, Uneven, Subconchoidal, Conchoidal, Brittle
ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
Very poor [100]
None, but may exhibit slight parting
1.7 Mohs Hardness
1.8 Chemical Composition
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)