| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Illinois > Fluorite with Bitumen |
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| DESCRIPTION: | No. 37833 |
| Mineral: | Fluorite with Bitumen |
| Locality: | Minerva #1 Mine, Cave-in-Rock District, Hardin County, Illinois |
| Description: | Transparent purple fluorite crystals with a brownish surface coating of bitumen (naturally occurring oil) that partially obscures the internal transparency. The bitumen coating could be removed by soaking in a petroleum solvent. |
| Overall Size: | 11x6x4 cm |
| Crystals: | 3-4.5 cm |
| Archived: | For reference only |
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