General Information:
Chemical Formula:
(Ni,Fe)S2
Composition:
(Molecular Weight = 122.11 gm)
Iron 11.43 % Fe
Nickel 36.05 % Ni
Sulfur 52.52 % S
Empirical Formula:
Ni0.75Fe2+0.25S2
IMA Status:
Not IMA Approved
Name Origin:
Named after the Peruvian scientist, J. J. Bravo (1874-1928).
Physical Properties:
Cleavage:
None
Color:
steel gray.
Density:
5 - 5.02, Average = 5.01
Diaphaniety:
Opaque
Habits:
Striated - Parallel lines on crystal surface or cleavage face., Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces., Stalactitic - Shaped like pendan t columns as stalactites or stalagmites
Hardness:
6.5 - Pyrite
Luster:
Metallic
Streak:
black
More details...