1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven, Conchoidal, Conchoidal to uneven, Brittle
Uneven, Brittle, Metallic
1.6 Cleavage
On {10 1 1} perfect; parting on {10 1 2}
Perfect on [001] imperfect on [100]
1.7 Mohs Hardness
1.8 Chemical Composition
MnCO3
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)