jamesonite

[jeym-suh-nahyt]
noun
a metallic, dark-gray mineral, lead and iron antimony sulfide: formerly mined for lead.

Origin:
1815–25; named after Robert Jameson (1774–1854), Scottish scientist; see -ite1

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Arsenopyrite, jamesonite, and visible free gold are reported from quartz-sulfide veins in the old prospect pits.
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