1 Physical Properties
1.1 Tenacity
1.2 Solubility
none
Gelatinises in acids
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.5 Fracture
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Conchoidal, Brittle
2.6 Cleavage
None, but may exhibit slight parting
Distinct on {110}
2.7 Mohs Hardness
2.11 Chemical Composition
MgAl2O4
(Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2