Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-3.023.85-3.94
1
7.18
👆🏻
Fracture
-
Conchoidal, Uneven
Cleavage
Perfect
{010} Good, {100} Distinct
Mohs Hardness
-99995-5.5
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)