Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.21-3.383.87-4.14
1
7.18
👆🏻
Fracture
Irregular/uneven, Uneven
Subconchoidal, Conchoidal
Cleavage
Perfect on {001}
Poor on {120}, in traces on {001}
Mohs Hardness
6-75.5-6
2
10
👆🏻
Chemical Composition
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references