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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.
Research Ullmannite
 
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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