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Webster 1913 Edition

Noun.

[From

Prof.

Jameson

, of Edinburgh.]

(Min.)

A steel-gray mineral, of metallic luster, commonly fibrous massive. It is a sulphide of antimony and lead, with a little iron.

jamesonite ‎(plural jamesonites)

(mineralogy) A dark grey monoclinic sulfosalt mineral with chemical formula Pb₄FeSb₆S₁₄.