Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.6-3.32.97-3.03
1
7.18
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Fracture
Lamellar
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Perfect 001
{001} Poor
Mohs Hardness
2-2.57
2
10
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Chemical Composition
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6
CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references