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.
Densities and Biomasses of Some Ungulate Populations in Eastern Congo and Rwanda, with Notes On Population Structure and Lion/Ungulate Ratios
