Chemical Composition of Meteorites


Sodium and Potassium

Na2O and K2O vs. Fe2O3(T) + MgO




Most terrestrial rocks are richer in Na2O than any meteorite. Rocks with >2% Na2O are probably not meteorites.



Sodium and potassium are both alkali elements, and all alkali elements are in low concentrations in meteorites compared to most terrestrial rocks. Rocks with greater than 0.6% K2O are probably not meteorites.



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Prepared by:

Randy L. Korotev

Department of Earth and Planetary Sciences

Washington University in St. Louis

Please don't contact me about the meteorite you think you’ve found until you read this and this.


Last revised:  7 November 2018