Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
3.15.00-5.20
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect {010} imperfect {100}
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
6-76-6.5
2
10
👆🏻
Chemical Composition
Ca2Al3(SiO4)3(OH)
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references