General Information:
Chemical Formula:Fe++Nb2O6
Composition:(Molecular Weight = 337.66 gm)Niobium 55.03 %
NbIron 16.54 %
FeOxygen 28.43 %
O Empirical Formula: Fe2+Nb2O6
Environment:Pegmatites, and alluvial deposits.
Locality:M'buye Mine, Rwanda.
Name Origin:Named after its content of the element niobium, formerly called columbium and the Latin ferrium - "iron."
Physical Properties: Cleavage:[010] Distinct
Color:black or brownish black.
Density:5.3 - 7.3, Average = 6.3
Diaphaniety:Translucent to opaque
Habits:Massive - Granular - Common texture observed in granite and other igneous rock., Striated - Parallel lines on crystal surface or cleavage face.,
Hardness:6 - Orthoclase
Luminescence:Non-fluorescent.
Luster:Sub Metallic
Streak:blackish brown
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