Tenacity
Brittle
Brittle
Solubility
Soluble
insoluble in water
Durability
-
-
Specific Gravity
4.3-55.00-5.20
1
7.18
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Fracture
Irregular/uneven
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect cleavage parallel to base and prism faces: {001} Perfect, {210} Perfect, {010} Imperfect
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
3-3.56-6.5
2
10
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Chemical Composition
BaSO4
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references