RT Journal Article
SR Electronic
T1 Phosphide from Metorites: Barringerite, a New Iron-Nickel Mineral
JF Science
JO Science
FD American Association for the Advancement of Science
SP 169
OP 171
DO 10.1126/science.165.3889.169
VO 165
IS 3889
A1 Buseck, Peter R.
YR 1969
UL http://science.sciencemag.org/content/165/3889/169.abstract
AB 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.