Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.6-3.34.392
1
7.18
👆🏻
Fracture
Lamellar
Conchoidal
Cleavage
Perfect 001
{010} moderate, {100} imperfect
Mohs Hardness
2-2.56.5-7
2
10
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Chemical Composition
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6
Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)