| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Bolivia > Bournonite (cogwheel twins) |
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| DESCRIPTION: | No. 80922 |
| Mineral: | Bournonite (cogwheel twins) |
| Locality: | Viboras Mine, Machacamarca, Saavedra Province, Potosí, Bolivia |
| Description: | Large lustrous gray-metallic bournonite crystals exhibiting classic cogwheel habit caused by fourling twins on the {110} plane. There are three bournonite cogwheel twins to 20 mm across that grew together and are easily distinguished. Ex. Miller #M3057; originally acquired in 2014 |
| Overall Size: | 4x3.5x3 cm |
| Crystals: | 1-12 mm |
| Archived: | For reference only |
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