Tenacity
Brittle
Brittle
Solubility
Soluble
Soluble
Durability
-
-
Specific Gravity
4.3-53.25-3.35
1
7.18
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Fracture
Irregular/uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect cleavage parallel to base and prism faces: {001} Perfect, {210} Perfect, {010} Imperfect
Perfect in three directions
Mohs Hardness
3-3.55
2
10
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Chemical Composition
BaSO4
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references