General Information:
Chemical Formula:
(Fe,Mn)WO4
Composition:
(Molecular Weight = 303.24 gm)
Manganese 9.06 % Mn
Iron 9.21 % Fe
Tungsten 60.63 % W
Oxygen 21.10 % O
Empirical Formula:
Fe2+0.5Mn2+0.5(WO4)
IMA Status:
Not IMA Approved
Name Origin:
From the German, Wolfram, name for tungsten.
Physical Properties:
Cleavage:
[010] Perfect
Color:
brownish black or iron black.
Density:
7.1 - 7.5, Average = 7.3
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
Luminescence:
None.
Luster:
Sub Metallic
Streak:
reddish brown
More details...