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Formula:   CuPbSbS3   mineral photo

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Crystal:   Orthorhombic  
Hardness:   2.5-3  
Spec. Gr.:   5.83  
Streak:   Steel gray to black  
Cleavage:   1 good, 2 fair  
Location:   Liskeard, Cornwall,

Bournonite was named after the French mineralogist and crystallographer Count J.L. de Bournone, who first determined the chemical composition in 1805. It is a hydrothermal ore mineral which contains forty-two percent lead, thirteen percent copper, and twenty four percent antimony. Large well-formed crystals were found at Liskeard, England; also at Pribram, Czechoslovakia; Neudorf and Andreasberg, Germany; and in Peru. Lustrous black bournonite crystals of good size and surrounded by white quartz crystals were the "trademark" of Liskeard, and are considered to be the world's finest.

Bibliography: Svenek, Jaroslav. Minerals, 1987, pg. 82-83.

University of California, Santa Barbara—Department of Earth Science
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