|
The Wolframite Group
|
Property |
ferberite |
wolframite |
huebnerite |
|
formula |
FeWO4 |
(Fe, Mn)WO4 |
MnWO4 |
|
WO3 content (%) |
76.3 |
76.5 |
76.6 |
|
Mn content (%) |
0 - 3.6 |
3.6 - 14.5 |
14.5 - 18.1 |
|
Fe content (%) |
18.4 - 14.7 |
14.7 - 3.7 |
3.7 - 0 |
|
specific gravity |
7.5gr/cc |
7.1 - 7.5 gr/cc |
7.2 - 7.3 gr/cc |
|
|
|
|
|
|
form |
well defined crystals |
irregular groups of radiating crystals |
radiating thin crystals |
|
color |
black |
dark grey to black |
red-brown to black |
|
luster |
submetallic to metallic |
submetallic to metallic |
submetallic to adamantine |
|
diaphaneity |
opaque to translucent |
opaque |
opaque to translucent |
|
streak |
dark brown |
dark brown |
red-brown to green-yellow |
|
|
|
|
|
|
crystal structure |
monoclinic |
monoclinic |
monoclinic |
|
cleavage |
1 direction, perfect |
1 direction, perfect |
1 direction, perfect |
|
fracture |
uneven |
uneven |
uneven |
|
hardness |
5 Mohs |
5 -5.5 Mohs |
5 Mohs |
|
magnetism |
feeble |
slight |
none |
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Midwest Tungsten Service
7101 S. Adams St. #6
Willowbrook, IL 60527 |
Toll Free: 1-800-626-0226
Phone: 1-630-325-1001
Fax: 1-630-325-3571 |
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