Ullmannite
Pronunciation : Ull"mann*ite
Part of Speech : n.
Etymology : [So named after J. C. Ullman, a German chemist.] (Min.)
Definition : Defn: A brittle mineral of a steel-gray color and metallic luster, containing antimony, arsenic, sulphur, and nickel.
Source : Webster's Unabridged Dictionary, 1913