1 Physical Properties
1.1 Tenacity
1.3 Solubility
Not Available
Not Available
1.5 Durability
Not Available
Not Available
1.7 Specific Gravity
2.78-2.883.65-4.55
1
7.18
1.9 Fracture
Micaceous, Brittle
ConchoidalArthur Thomas, Gemstones (2009)
1.11 Cleavage
Perfect on the {001}
None, but may exhibit slight parting
1.13 Mohs Hardness
1.15 Chemical Composition
KAl 2AlSi 3O 10(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)