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Evidence for hibbingite–kempite solid solution

Published online by Cambridge University Press:  05 July 2018

Bernhardt Saini-Eidukat ,
Nikolai S. Rudashevsky  and
Alexander G. Polozov
Bernhardt Saini-Eidukat
Affiliation:
Department of Geosciences, North Dakota State University, Fargo, ND, 58105-5517, USA
Nikolai S. Rudashevsky
Affiliation:
Mechanobr Technical Corporation, 21 Line 8A, St. Petersburg, 199026, Russia
Alexander G. Polozov
Affiliation:
Institute of Geochemistry, SB RAS, P.O. Box 4019, 664033 Irkutsk, Russia
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Abstract

New occurrences of hibbingite, γ-Fe2(OH)3Cl, have been found associated with platinum-group minerals in the Noril'sk Complex, and with the Korshunovskoye iron ores of the southern Siberian platform. The Norils'k grains, which are up to 0. 6 mm in diameter, are associated with the platinumgroup minerals froodite, cabriite, urvantsevite and with native silver in massive pentlandite–cubanite– chalcopyrite ore. The Korshunovskoye iron ore sample in which hibbingite was found is composed of fine-grained magnetite ore associated with halite. Hibbingite, hematite and silver grains are found in cavities in halite; the reddish-brown hibbingite grains usually occur as encrustations in the cavities. The size of hibbingite and hematite grains is up to 100 µm.

Hibbingite from the Noril'sk Complex contains a significant kempite (Mn2(OH)3Cl) component; in some cases it contains over 50 mol. % Mn. These data suggest that at least a partial solid solution series exists between hibbingite and kempite. All known occurrences of hibbingite represent paragenetically late mineral assemblages. In the case of the Korshunovskoye deposits, the occurrences are associated with highly concentrated hydrothermal brines derived from the Lower Paleozoic saline sediments of the Siberian Platform cover.

Keywords

hibbingitekempitesolid solutionNoril'sk complexKorshunovskoye iron oresplatinum-group mineral
Type
Research Article
Information
Mineralogical Magazine , Volume 62 , Issue 2 , April 1998 , pp. 251 - 255
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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