Ullmannite

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]