Definitions for ullmannite
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Wiktionary
ullmannite(Noun)
A nickel antimony sulphide mineral.
Origin: Johann Christoph Ullmann (1771-1821), German mineralogist, and -ite.
Webster Dictionary
Ullmannite(noun)
a brittle mineral of a steel-gray color and metallic luster, containing antimony, arsenic, sulphur, and nickel
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