Tenacity
Brittle
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.20-2.265.00-5.20
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect on {110}
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
5-5.56-6.5
2
10
👆🏻
Chemical Composition
Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references