| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Colorado > Phenakite (drill-bit twin) |
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| DESCRIPTION: | No. 55664 |
| Mineral: | Phenakite (drill-bit twin) |
| Locality: | Mount Antero, Chaffee County, Colorado |
| Description: | Doubly-terminated colorless transparent phenakite crystal with lustrous faces that has a complex termination caused by repeated twinning resulting in reentrant faces that resembles a pneumatic rock drill bit (called drill-bit twins by local collectors). |
| Overall Size: | 12x6x6 mm |
| Crystals: | 12 mm |
| Archived: | For reference only |
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