1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Gelatinises in acids
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Conchoidal, Brittle
1.6 Cleavage
None, but may exhibit slight parting
Distinct on {110}
1.7 Mohs Hardness
1.8 Chemical Composition
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
(Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2