1 Physical Properties
1.1 Tenacity
Very brittle
Not Available
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.30-3.402.08-2.16
1
7.18
1.5 Fracture
Conchoidal, Brittle, Conchoidal
Irregular/uneven, UnevenArthur Thomas, Gemstones (2009)
1.6 Cleavage
{010} perfect, {110} distinct, {100} in traces
distinct/good on {1011}
1.7 Mohs Hardness
1.8 Chemical Composition
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
CaAl 2Si 4O 12 -6H 2OArthur Thomas , Gemstones (2009)