1. 
   ullmannite
   <chemical> A brittle mineral of a steel-gray colour and metallic luster, containing antimony, arsenic, sulphur, and nickel. ... Origin: So named after J. C. Ullman, a German chemist. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?ullmannite
   
   
2. 
   Ullmannite
   • (n.) A brittle mineral of a steel-gray color and metallic luster, containing antimony, arsenic, sulphur, and nickel.
   Found op http://thinkexist.com/dictionary/meaning/ullmannite/
   
   
3. 
   Ullmannite
   Ullmannite is a nickel antimony sulfide mineral with formula: NiSbS. Considerable substitution occurs with cobalt and iron in the nickel site along with bismuth and arsenic in the antimony site. A solid solution series exists with the high cobalt willyamite. ==Physical properties== Ullmannite is st...
   Found op http://en.wikipedia.org/wiki/Ullmannite
   
   
4. 
   Ullmannite
   Ullmannite, named after J. C. Ullman, the German chemist, is a brittle mineral of a steel-grey colour and metallic lustre, containing antimony, arsenic, sulphur, and nickel.
   Found op http://www.probertencyclopaedia.com/browse/HU.HTM
   
   

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