Phosphide from Metorites: Barringerite, a New Iron-Nickel Mineral

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Science  11 Jul 1969:
Vol. 165, Issue 3889, pp. 169-171
DOI: 10.1126/science.165.3889.169


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 (Fe0.58Ni0.42Co0.003)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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