General Information:
Chemical Formula:
Pb(Ti,Fe,Mn)21O38
Composition:
(Molecular Weight = 1,904.66 gm)
Titanium 25.14 % Ti
Manganese 11.54 % Mn
Iron 20.52 % Fe
Lead 10.88 % Pb
Oxygen 31.92 % O
Empirical Formula:
PbTi10Fe2+7Mn2+4O38
Locality:
Dattos, Curralinho, and other localities near Diamantina, Minas Gerias, Brazil.
Name Origin:
Named for Joaquim de Costa Sena, Esola de Minas, Ouro Preto, Brazil.
Physical Properties:
Cleavage:
None
Color:
black.
Density:
5.3
Diaphaniety:
Subopaque to Opaque
Habits:
Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals., Tabular - Form dimensions are thin in one direction.,
Hardness:
6-6.5 - Orthoclase-Pyrite
Luster:
Sub Metallic
Streak:
brownish black
More details...