Ullmannite 909999 193081269 2008-02-21T18:15:05Z Rhanyeia 4370225 wikilinked chemical formula, fix a bit '''Ullmannite''' is a [[nickel]] [[antimony]] [[sulfide]] [[mineral]] with formula: [[nickel|Ni]][[antimony|Sb]][[sulfur|S]]. 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. It is steel-gray to tin white in colour with a metallic luster. It has a [[Mohs hardness]] of 5 to 5.5 and a [[specific gravity]] of 6.65. It crystallizes in the [[cubic (crystal system)|isometric crystal class]] and typically exhibits cubic, octahedral, or pyritohedral forms although euhedral crystals are rare. [[Crystal twinning]] is common. Principal localities are in [[Germany]], it is also found in [[Austria]], [[Australia]], [[France]], [[England]], and [[Wales]]. It was discovered in 1843 at the Storch und Schöneberg Mine, North Rhine-Westphalia, Germany and named for the [[Germany|German]] [[chemist]] and [[mineralogist]], Johann Christoph Ullmann (1771-1821). ==See also== *[[List of minerals]] *[[List of minerals named after people]] ==References== * Palache, C., H. Berman, and C. Frondel (1944) ''Dana’s system of mineralogy'', (7th edition), v. I, 301–302. * [http://rruff.geo.arizona.edu/doclib/hom/ullmannite.pdf Mineral Data Publishing, PDF] * [http://webmineral.com/data/Ullmannite.shtml Webmineral data] * [http://www.mindat.org/show.php?id=4086&ld=1&pho= Mindat with location data] {{mineral-stub}} [[Category:Nickel minerals]] [[Category:Antimony minerals]] [[Category:Sulfosalt minerals]] [[de:Ullmannit]] [[it:Ullmannite]] [[nl:Ullmanniet]]