Comments on the publication by Rachel S. Kirby, Penelope L. King, and Andrew G. Tomkins “A statistical investigation into relationships between the IIE irons and the ordinary, F and ‘HH’ chondrites.”Meteoritics & Planetary Science 60, Nr 10, 2376–2400
Marina A. Ivanova, Michael K. Weisberg
MAPS, Version of Record online: 20 October 2026
“These comments are devoted to our observations based on recently reviewing publications regarding reduced ungrouped chondrites (F-, HH, and others). In these publications, the authors defined a group of “F-chondrites,” comprising previously ungrouped chondrites of petrologic types 3 and 4 that exhibit very low fayalite (Fa) content. One publication concluded that certain reduced chondrites belonged to the F-group based solely on cluster analysis, disregarding previously published petrologic data for these meteorites. We propose that the meteorites classified as F-chondrites in these publications actually comprise at least two distinct groups: the F-chondrites and metal-rich, matrix-free chondrites of the “G” group. The average olivine composition in F-chondrites is Fa4.06 ± 1.48 mole%, whereas in G-group chondrites it is Fa0.70 ± 0.43 mole%. Notably, it is impossible to determine the petrologic type of G-group chondrites due to differences in the evolution and thermal history of their parent asteroid, and reduced chondrites, also G chondrites and reduced chondrites are very different in texture and petrography.”
R. S. Kirby, P. L. King, A. G. Tomkins
MAPS, Version of Record online: 05 October 2026
A statistical investigation into the relationships between the IIE irons and the ordinary, F and “HH” chondrites. (published online: 5 September 2025)
