| dbts FERBERITE, Chance Mine, Boulder County, Colorado, 3 x 2 x 1.5 cm | |
 | Thumbnail sized specimen of black Ferberite from a Colorado mine. |
 |
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| dbts FERBERITE, Chance Mine, Boulder County, Colorado, 3 x 2 x 1.5 cm | |
| Thumbnail sized specimen of black Ferberite from a Colorado mine. |
|