Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
Subconchoidal, Conchoidal
Poor on {120}, in traces on {001}
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references