from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A sulfosalt mineral, a sulfantimonite of lead and copper.
from the GNU version of the Collaborative International Dictionary of English
- n. A mineral of a steel-gray to black color and metallic luster, occurring crystallized, often in twin crystals shaped like cogwheels (wheel ore), also massive. It is a sulphide of antimony, lead, and copper.
from The Century Dictionary and Cyclopedia
- n. A sulphid of antimony, lead, and copper, of a steel-gray color and brilliant metallic luster, found in the Harz mountains, Cornwall, and Mexico.
Also related: this MathTrek article, Riding on square wheels, showing another nice example of unusual gearing, Stan Wagon's square-wheeled tricycle; and bournonite (aka cogwheel ore).
Jamesonite, bournonite, and tetrahedrite (sulphantimonides of lead and copper), when found in lead-silver deposits, are to some extent