1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.20-2.263.65-4.55
1
7.18
1.5 Fracture
Uneven, Brittle, Metallic, Gemstones (2009)
ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
Perfect on {110}
None, but may exhibit slight parting
1.7 Mohs Hardness
1.8 Chemical Composition
Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)