Bournonite
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Bournonite, 10.1 cm, from the Machacamarca district, Cornelio Saavedra Province, Potosí, Bolivia. These unusual bournonite cogwheels are from a recently discovered occurrence in the district (not the Viboras mine) discovered around 2019. Tom Spann photo.
Product details
SpeciesBournonite
SizeCabinet
Dimensions10.1 cm
Added on02/13/2026
LocalityBolivia, Potosí, Machacamarca mining district
Publications
- Mineralogical Record Mineral Collecting In Texas page 228
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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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