Hypertext Webster Gateway: "bournonite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Bournonite \Bour"non*ite\, n. [Named after Count Bournon, a
mineralogist.] (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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