1 Physical Properties
1.1 Tenacity
1.3 Solubility
1.5 Durability
Not Available
Not Available
1.7 Specific Gravity
2.57-2.663.30-3.40
1
7.18
1.11 Fracture
Subconchoidal, Conchoidal, Brittle
Conchoidal, Brittle, Conchoidal
1.13 Cleavage
Fair on {100}, poor on {001} and {010}
{010} perfect, {110} distinct, {100} in traces
1.14 Mohs Hardness
1.16 Chemical Composition
Mg2Al4Si5O18
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references