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specimen video

Bournonite

Unknown Owner
Metalic silver crystals of Bournonite forming cyclic twins with very well formed faces and edges and displaying the classic cogwheel shape.It is disposed on a matrix with small lustrous crystals of Pyrite and Quartz. The piece is in excellent condition. Watch video.

Product details

Species
BournoniteAbout Bournonite →
SizeCabinet
Dimensions7.0 x 12.0 cm
Added on06/16/2025
Locality
Bolivia, Potosí, Machacamarca mining district

Known provenance

DateCollectorAcquisition price
06/2025Unknown OwnerNot disclosed
—MChMineralsNot disclosed

Learn more

Bournonite
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
Bournonite from Machacamarca mining district
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