Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.21-3.385.9-6.3
1
7.18
👆🏻
Fracture
Irregular/uneven, Uneven
Conchoidal, Uneven
Cleavage
Perfect on {001}
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
6-74.5-5
2
10
👆🏻
Chemical Composition
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references