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Title:
Cobalt-rich, nickel-poor metal (wairauite) in the Ningqiang carbonaceous chondrite
Authors:
Xin, Hua; Eisenhour, Don D.; Buseck, Peter R.
Affiliation:
AA(Arizona State Univ., Tempe, AZ), AB(Arizona State Univ., Tempe, AZ), AC(Arizona State Univ., Tempe, AZ)
Publication:
Meteoritics (ISSN 0026-1114), vol. 30, no. 1, p. 106-109
Publication Date:
01/1995
Category:
Lunar and Planetary Exploration
Origin:
STI
NASA/STI Keywords:
CARBONACEOUS CHONDRITES, CHEMICAL COMPOSITION, COBALT, NICKEL, OXIDATION, ELECTRON MICROSCOPY, X RAY ANALYSIS
Bibliographic Code:
1995Metic..30..106X

Abstract

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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