General Information:
Chemical Formula:
Fe++WO4
Composition:
(Molecular Weight = 303.69 gm)
Iron 18.39 % Fe
Tungsten 60.54 % W
Oxygen 21.07 % O
Empirical Formula:
Fe2+(WO4)
Name Origin:
After Rudolph Ferber of Gera, Germany.
Physical Properties:
Cleavage:
[010] Perfect
Color:
black.
Density:
7.5 - 7.4, Average = 7.45
Diaphaniety:
Opaque
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Lamellar - Thin laminae producing a lamellar structure., Massive - Granular - Common texture observed in granite an d other igneous rock.
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Sub Metallic
Streak:
brownish black
More details...