Cobalt-rich, nickel-poor metal (wairauite) in the Ningqiang carbonaceous chondrite

Details Cobalt-rich, nickel-poor metal (wairauite) in the Ningqiang carbonaceous chondrite Cobalt-rich, nickel-poor metal (wairauite) in the Ningqiang carbonaceous chondrite

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995metic..30..106x&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 30, no. 1, p. 106-109

Computer Science

Carbonaceous Chondrites, Chemical Composition, Cobalt, Nickel, Oxidation, Electron Microscopy, X Ray Analysis

Scientific paper

A structurally ordered cubic metal grain containing approximately 39 wt% Co, 61 wt% Fe, and less than 0.6 wt% Ni (approximately Fe3Co2) was found associated with troilite and pentlandite in the matrix of the Ningqiang carbonaceous chondrite. This mineral is similar to terrestrial wairauite. Experimental data in the Fe-Co system indicate that this CsCl-type Co-rich metal is stable below 700 C. Phase relations in the Fe-Co-Ni system show that Co cannot fractionate from Ni above 500 C. The dominant opaque minerals of awaruite, magnetite, and pentlandite in Ningqiang suggest relatively oxidizing conditions.

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