Author:
Cabral A. R.,Skála R.,Vymazalová A.,Kallistová A.,Lehmann B.,Jedwab J.,Sidorinová T.
Abstract
AbstractKitagohaite, 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.
Subject
Geochemistry and Petrology
Cited by
8 articles.
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