2 : SULFIDES and SULFOSALTS (sulfides, selenides,
tellurides; arsenides, antimonides, bismuthides; sulfarsenites,
sulfantimonites, sulfbismuthites, etc.) E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
is a rare nickel
antimony sulfide mineral and a member of the Cobaltite Group
of minerals that also includes Cobaltite and Gersdorffite
among others. Ullmannite has a steel-gray to silver-white
color and metallic luster with a Mohs hardness of 5.0
- 5.5. It is very similar to the nickel arsenic sulfide called
Gersdorffite. Gersdorffite's formula is NiAsS compared
to Ullmannite's formula of NiSbS. Gersdorffite's formula shows
the substitution of arsenic (As) for the antimony (Sb)
in Ullmannite's formula, although Ullmannite usually
has some arsenic in its chemistry. Ullmannite is rarer
than Gersdorffite but the two minerals are almost indistinguishable
from each other by ordinary evaluation means.
was named after Johann Christoph Ullmann (1771-1821), German mineralogist and chemist.
Ullmann is considered to be one of the fathers of systematic mineralogy. Ullmann established a
mineral collection (now the basis for the internationally renowned
Museum of Mineralogy in Marburg) and authored Ein
Systematisch Tabellarische Übersicht der Mineralogisch einfachen Fossilien, one of the first attempts to provide a structured organization to the observed minerals of the day.
distribution: in Germany, in North Rhine-Westphalia,
from Freusburg at the Friedrich mine, near Wissen; the
Petersbach mine, near Eichelhardt; Gosenbach; Salchendorf;
and at Ramsbeck; in the Harz Mountains, from Neudorf;
and elsewhere From Lölling, Carinthia, Austria.
In France, at Ar, near Eaux-Bonnes, Pyrénées-Atlantiques.
From Monte Narba and Masaloni, Sarrabus, Sardinia, Italy.
In the Settlingstones mine, Fourstones, Northumberland,
and at New Brancepeth colliery, Durham, England. From
the Talnakh area, Noril’sk region, western Siberia,
Russia. In the Esperanza mine, Salta Province, Argentina.
In Canada, at the Kerr Addison mine, Timiskaming district,
Ontario; and from the Nicholson mine, near Goldfields,
Saskatchewan. At Broken Hill, New South Wales, Australia.
In the Champion Reef mine, Kolar Gold Fields, Karnataka,
India. Dozens of additional minor localities are known.
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