Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.08-2.165.00-5.20
1
7.18
👆🏻
Fracture
Irregular/uneven
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
distinct/good on {1011}
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
4.56-6.5
2
10
👆🏻
Chemical Composition
CaAl 2Si 4O 12 -6H 2OArthur Thomas , Gemstones (2009)
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references