Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.06-3.193.25-3.35
1
7.18
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Fracture
Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
{010} Perfect
Perfect in three directions
Mohs Hardness
4-55
2
10
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Chemical Composition
Mn 8Si 6O 15(OH,Cl) 10Ulrich Henn and Claudio C.
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references