General Information:
Chemical Formula:(Fe++,Mg)4(Fe+++,V+++)2[Si6O15](O,OH)8
Composition:(Molecular Weight = 861.42 gm)Magnesium 1.41 %
MgVanadium 2.96 %
V Iron 32.42 %
FeSilicon 19.56 %
SiHydrogen 0.94 %
H Oxygen 42.72 %
O Empirical Formula: Fe2+3.5Mg0.5Fe3+1.5V3+0.5Si6O15OH8
IMA Status:Approved IMA 1985
Locality:Harhada iron deposit, near the Jining-Erlian railway, Inner Mongolia, China.
Name Origin:Named for the locality.
Physical Properties: Cleavage:[001] Perfect, [100] Perfect
Color:black.
Density:3.11
Diaphaniety:Nearly opaque
Habits:Fibrous - Crystals made up of fibers., Platy - Sheet forms (e.g. micas)., Aggregates - Made of numerous individual crystals or clusters.
Hardness:3.5 - Copper Penny
Luster:Silky
Streak:brown
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