Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.06-3.193.85-3.94
1
7.18
👆🏻
Fracture
Uneven
Conchoidal, Uneven
Cleavage
{010} Perfect
{010} Good, {100} Distinct
Mohs Hardness
4-55-5.5
2
10
👆🏻
Chemical Composition
Mn 8Si 6O 15(OH,Cl) 10Ulrich Henn and Claudio C.
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)