Physics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.281..360s&link_type=abstract
Nature, vol. 281, Oct. 4, 1979, p. 360-362.
Physics
11
Meteorites, Taenite, Iron, Nickel, Kamacite, Metals, Grains, Chondrites, Reflected-Light Microscopy, Electron Probe Analysis, Anisotropy, Phases, Mixing, Iron Meteorites, Optical Properties, Mesosiderites, Oxidation, Cooling, Electron Microscopy
Scientific paper
Results of reflected-light microscopy and electron-probe analysis of clear taenite (48 to 57% Ni) in meteoritic metal are presented. Optically anisotropic clear taenite has been found as irregular grains and sharply defined rims on grains of zoned taenite in H, L, LL and CO3 chondrites, diogenites, iron meteorites, mesosiderites and pallasites and is concluded to exist in all slowly cooled meteorites containing zone taenite. It is proposed that large clear taenite grains formed from zoned taenite by the inward growth of clear taenite rims at low temperatures. The anisotropic clear taenite is concluded to be the ordered, tetragonal FeNi phase identified by Albertsen et al. (1978), in two iron meteorites by the similarity of its Moessbauer spectrum to that of synthetic tetragonal FeNi and the presence of X-ray reflections which violated the fcc lattice of taenite.
Clarke Roy S.
Scott Edward R. D.
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