ullmannite


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ullmannite

[′əl·mə‚nīt]
(mineralogy)
NiSbS A steel-gray to black mineral consisting of nickel antimonide and sulfide, usually with a little arsenic, occurring massive, and having a metallic luster. Also known as nickel-antimony glance.
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This has been complemented by the discovery of a suite of primary minerals which are uncommon in the Mississippi Valley type deposits of the north Pennines including bournonite, millerite, strontianite, ullmannite, and (perhaps) hydromagnesite.
Ullmannite is extremely rare, occurring only in one cleft, in grains small than 0.1 ram, along the contacts between breithauptite and pyrite grains.
chalcopyrite, pentlandite, pyrite, cobaltite-gersdorffite series, arsenopyrite, ullmannite, violarite, chromite, ilmenite, sphalerite, covellite, argentopentlandite, breithauptite, marcasite, nickeline, galena, rutile, barite, hessite, Au-Ag alloys, sperrylite, moncheite, sudburyite, testibiopalladite, kotulskite, mertieite-II, stibiopalladinite, geversite, melonite and four undefined minerals.
Tetrahedrite also has been identified as sparse, black masses to 2 mm in dense, gray quartz in a second specimen collected from the underground workings, and silver-bearing tetrahedrite occurs as a trace constitute in the altered metasedimentary rocks with pyrrhotite, chalcopyrite and ullmannite.