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Cobalt-rich, nickel-poor metal (wairauite) in the Ningqiang carbonaceous chondrite (1995)

Xin, Hua ; Eisenhour, Don D. ; Buseck, Peter R.

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Publication Date: 2019-08-28

Description: 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.

Keywords: LUNAR AND PLANETARY EXPLORATION

Type: Meteoritics (ISSN 0026-1114); 30; 1; p. 106-109

Format: text

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