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The Wolframite Group Properties
| Property | ferberite | wolframite | huebnerite |
| Picture |  |
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| 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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