General Information:
Chemical Formula:
(V,Fe)4Ti3AsO13(OH)
Composition:
(Molecular Weight = 647.82 gm)
Titanium 22.17 % Ti
Vanadium 30.67 % V
Iron 0.86 % Fe
Arsenic 11.57 % As
Hydrogen 0.16 % H
Oxygen 34.58 % O
Empirical Formula:
V4+3.9Fe3+0.1Ti3AsO13(OH)
IMA Status:
Approved IMA 1979
Locality:
Kalgoorlie, WA., Australia.
Name Origin:
Named for Stephan A. Tomich (1914-), consulting geologist who discovered the mineral.
Physical Properties:
Cleavage:
None
Color:
black.
Density:
4.16
Diaphaniety:
Opaque
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
6 - Orthoclase
Luster:
Resinous
Streak:
black
More details...