Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.6-3.33.85-3.94
1
7.18
👆🏻
Fracture
Lamellar
Conchoidal, Uneven
Cleavage
Perfect 001
{010} Good, {100} Distinct
Mohs Hardness
2-2.55-5.5
2
10
👆🏻
Chemical Composition
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)