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Updated: Sep 24, 2025

Picometer-Precision Atomic Position Tracking through Electron Microscopy
Published on: July 3, 2021
Comment on "Discovery of davemaoite, CaSiO3-perovskite, as a mineral from the lower mantle"
Michael J Walter1, Simon C Kohn2, D Graham Pearson3
1Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA.
Abstract:
Tschauner et al. (Reports, 11 November 2021, p. 891) present evidence that diamond GRR-1507 formed in the lower mantle. Instead, the data support a much shallower origin in cold, subcratonic lithospheric mantle. X-ray diffraction data are well matched to phases common in microinclusion-bearing lithospheric diamonds. The calculated bulk inclusion composition is too imprecise to uniquely confirm CaSiO3 stoichiometry and is equally consistent with inclusions observed in other lithospheric diamonds.
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