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millerite

millerite2 Min.
  (ˈmɪləraɪt)
  [ad. G. millerit: named by W. Haidinger in 1845 after W. H. Miller, professor of mineralogy at Cambridge 1832–1870: see -ite1.]
  Native sulphide of nickel, usually occurring in brassy or bronze crystals; capillary pyrites.

1854 Dana Syst. Min. (ed. 4) II. 49 Millerite, Haid. Capillary Pyrites. Sulphuret of Nickel [etc.]. 1881 Ruskin Let. in St. George (1903) VI. 358, I would have kept the millerite, but the specimen was not pretty.

Oxford English Dictionary

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