• Webster's Revised Unabridged Dictionary
    • n Bournonite (Min) 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.
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Century Dictionary and Cyclopedia
    • n bournonite A sulphid of antimony, lead, and copper, of a steel-gray color and brilliant metallic luster, found in the Harz mountains, Cornwall, and Mexico. Wheel-ore is a variety which owes its name to the form of the twin crystals, resembling a cog-wheel. Also called endellionite.
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Webster's Revised Unabridged Dictionary
Named after Count Bournon, a mineralogist