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Kitagohaite, Pt7Cu, a new mineral from the Lubero region, North Kivu, Democratic Republic of the Congo

Published online by Cambridge University Press:  05 July 2018

A. R. Cabral ,
R. Skála ,
A. Vymazalová ,
A. Kallistová ,
B. Lehmann ,
J. Jedwab  and
T. Sidorinová
A. R. Cabral*
Affiliation:
Lagerstätten und Rohstoffe, Technische Universität Clausthal, Adolph-Roemer-Str. 2A, 38678 Clausthal-Zellerfeld, Germany
R. Skála
Affiliation:
Institute of Geology of the Academy of Sciences of the Czech Republic, v.v.i., Rozvojová 269, CZ-165 00 Prague 6, Czech Republic
A. Vymazalová
Affiliation:
Czech Geological Survey, Geologická 6, CZ-152 00 Prague 5, Czech Republic
A. Kallistová
Affiliation:
Institute of Geology of the Academy of Sciences of the Czech Republic, v.v.i., Rozvojová 269, CZ-165 00 Prague 6, Czech Republic
B. Lehmann
Affiliation:
Lagerstätten und Rohstoffe, Technische Universität Clausthal, Adolph-Roemer-Str. 2A, 38678 Clausthal-Zellerfeld, Germany
J. Jedwab
Affiliation:
Université Libre de Bruxelles, CP 160/02, 50 Avenue Roosevelt, B-1050 Brussels, Belgium
T. Sidorinová
Affiliation:
Czech Geological Survey, Geologická 6, CZ-152 00 Prague 5, Czech Republic
*
E-mail: alexandre.cabral@tu-clausthal.de
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Abstract

Kitagohaite, ideally Pt7Cu, is a new mineral from the Lubero region of North Kivu, Democratic Republic of the Congo. The mineral occurs as alluvial grains that were recovered together with other Pt-rich intermetallic compounds and Au. Kitagohaite is opaque, greyish white and malleable and has a metallic lustre and a grey streak. In reflected light, kitagohaite is white and isotropic. The crystal structure of kitagohaite is cubic, space group Fmm, of the Ca7Ge type, with a = 7.7891(3) Å, V = 472.57(5) Å3 and Z = 4. The strongest diffraction lines [d in Å(I)(hkl)] are: 2.246 (100)(222), 1.948(8)(004), 1.377 (77)(044), 1.174(27)(622), 1.123 (31)(444) and 0.893 (13)(662). The Vickers hardness is 217 kg mm−2 (VHN100), which is equivalent to a Mohs hardness of 3½ and the calculated density is 19.958(2) g cm−3. Electron-microprobe analyses gave a mean value (n = 13) of 95.49 wt.% Pt and 4.78 wt.%Cu, which corresponds to Pt6.93Cu1.07 on the basis of eight atoms. The new mineral is named for the Kitagoha river, in the Lubero region.

Keywords

KitagohaitePt7CuLuberoNorth KivuDemocratic Republic of the Congo
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 3 , June 2014 , pp. 739 - 745
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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