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Mineralogical Magazine; December 2004; v. 68; no. 6; p. 871-885; DOI: 10.1180/0026461046860225
© 2004 Mineralogical Society of Great Britain and Ireland
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Euhedral crystals of ferroan platinum, cooperite and mertieite-II from alluvial sediments of the Darya river, Aldan Shield, Russia

G. G. Shcheka1,2,*, A. N. Solianik1, B. Lehmann2, A. Bieniok3, G. Amthauer3, D. Topa3 and J. H. G. Laflamme4

1 Far East Geological Institute, Russian Academy of Sciences, 159 Prospect 100-letya, Vladivostok 690022, Russia
2 Institute of Mineralogy and Mineral Resources, Technical University of Clausthal, Adolph-Roemer-Strasse 2a, D-38678 Clausthal-Zellerfeld, Germany
3 Institute of Mineralogy, University of Salzburg, Hellbrunnerstrasse 34, A-5020 Salzburg, Austria
4 Mining and Mineral Sciences Laboratories, Canada Centre for Mineral and Energy Technology, 555 Booth Street, Ottawa, Ontario K1A 0G1, Canada

* E-mail: Shcheka{at}email.com

Idiomorphic crystals (up to 3.5 mm) of ferroan platinum, cooperite and mertieite-II were found in a heavy-mineral concentrate from stream sediments of the Darya river in the Aldan Shield, Russia. Pt-Fe crystals display cubic and thin platy habits; occasionally they are twinned. The chemical composition ranges from Pt2.64Fe1.00 to Pt2.88Fe1.00 with Os, Ru, Ir, Rh and Pd below the analytical detection limit of the electron microprobe. X-ray diffractometry of Pt-Fe crystals suggests a F-centred cubic lattice, characteristic of ferroan platinum. Some of the ferroan platinum crystals have large (about 100 µm wide) cooperite overgrowth rims or are covered by a Au-Ag alloy. Cooperite also occurs as large euhedral crystals (up to 3 mm across, partly twinned). Crystals of mertieite-II are speckled with µm-sized (2–5 µm) inclusions of sperrylite and intergrown with minerals of cooperite-braggite solid solution, Pt-Pd-Hg alloy, keithconnite and Au-Ag alloy. Fractures along crystallographic planes of the mertieite-II crystals are filled with Pd-Pt-Fe-Sb-As-Hg-Te-Bi-bearing oxides. The coarse-grained PGM from the Darya have a geological setting similar to the Kondyor PGE placer 75 km to the northeast and are probably related to clinopyroxenite-hornblende-magnetite units of Alaskan-/Uralian-type intrusions.

KEYWORDS: ferroan platinum, cooperite, mertieite-II, PGE oxides, Au-PGE placer, Darya, Aldan Shield, Russia




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G. G. Shcheka, B. Lehmann, and A. N. Solianik
Pd-bearing oxides and hydrated oxides in mertieite-II crystals from alluvial sediments of the Darya river, Aldan Shield, Russia
Mineralogical Magazine, December 1, 2005; 69(6): 981 - 994.
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