Bournonite
Unknown Owner
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Bolivia’s Machacamarca District is known for it’s world-class bournonite specimens, and the lot we obtained in 2019 is the finest we have seen yet. This nice specimen features sharp, lustrous ‘cogwheel twinned’ crystals on a mound of black sphalerite matrix. The bournonite crystals are well-formed and in great condition.
Product details
SpeciesBournonite
SizeSmall Cabinet
Dimensions3.7 x 5.4 x 5.6 cm
Added on09/25/2025
LocalityBolivia, Potosí, Machacamarca mining district
Known provenance
| Date | Collector | Acquisition price |
|---|---|---|
| 04/2026 | Unknown Owner | $325.00 |
| — | Collector’s Edge | Not disclosed |
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Mineral guide
Learn about Bournonite
steel-gray to black sulfosalt famed for cogwheel twinning and metallic luster; prized by collectors for iconic gears and historic localities.Regional guide
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