Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Perfect on [001] imperfect on [100]
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Subconchoidal, Conchoidal
Perfect on [001] and [011]
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references