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For estimations of P - T conditions of igneous and metamorphic rocks, Fe 3+  in coexisting minerals is either assumed to be zero or is calculated from electron microprobe analyses (EMPA) based upon stoichiometry and charge balance. Geothermobarometers that involve Fe 2+  - Mg 2+  exchange can be significantly affected by either neglecting Fe 3+  or using incorrect values. Ratios of Fe 3+ /ΣFe in garnet and clinopyroxene measured by a Mössbauer milliprobe were compared to those calculated from EMPA of garnet and clinopyroxene from eclogite xenoliths from the Udachnaya kimberlite in Yakutia. The effects of Fe 3+  contents in garnet and clinopyroxene on temperature estimations were evaluated.

Precise Mössbauer milliprobe determination of ferric iron in rock-forming minerals and limitations of electron microprobe analysis