ullmannite


From The Collaborative International Dictionary of English v.0.48:

Ullmannite \Ull"mann*ite\, n. [So named after J. C. Ullman, a
   German chemist.] (Min.)
   A brittle mineral of a steel-gray color and metallic luster,
   containing antimony, arsenic, sulphur, and nickel.
   [1913 Webster]
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