PHOSPHIDE FROM METORITES - BARRINGERITE, A NEW IRON-NICKEL MINERAL

被引:63
作者
BUSECK, PR
机构
[1] Departments of Geology and Chemistry, Arizona State University, Tempe
关键词
D O I
10.1126/science.165.3889.169
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Schreibersite, (Fe,Ni)3P, and a higher phosphide, barringerite, occur in the Ollague pallasite. The composition of the higher phosphide, determined by electron probe microanalysis, is (Fe0.58Ni 0.42Co0.003)1.95P. It is hexagonal, with space group P62m and a=5.87±0.07 angstroms and c=3.44±0.04 angstroms. If we assume a primary origin, the new mineral indicates that troilite and Schreibersite crystallized at high temperatures. The occurrence of a higher phosphide in a pallasite indicates local nonequilibria within a group of meteorites that are remarkable for their overall degree of equilibrium crystallization.
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页码:169 / &
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