Record details

Title
    Kitagohaite, Pt.sub.7./sub.Cu, a new mineral from the Lubero region, North Kivu, Democratic Republic of the Congo
Author
    Cabral, A. R.
    Jedwab, J.
    Kallistová, Anna
    Lehmann, B.
    Sidorinová, T.
    Skála, Roman
    Vymazalová, A.
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Mineralogical Magazine
Vol./nr.
    Roč. 78, č. 3
Pages
    s. 739-745
Year
    2014
Notes
    Rozsah: 7 s. : P
Subject category
    Democratic Republic of the Congo
    kitagohaite
    Lubero
    North Kivu
    Pt.sub.7./sub.Cu
Keyword
    Congo
    Democratic
    Kitagohaite
    Kivu
    Lubero
    Mineral
    New
    North
    Pt.sub.7./sub.Cu
    Region
    Republic
Abstract (in english)
   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 Fm3¯m, of the Ca7Ge type, with a = 7.7891(3) A ˚ , V = 472.57(5) A ˚ 3 and Z = 4. The strongest diffraction lines [d in A ˚ (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 3 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.
Contributor
    AV ČR Brno, Geologický ústav
Contributor code
    AV ČR, GLÚ
Source format
    U
Import date
    23. 10. 2014