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The Meteoritical Society categorizes chondrites by class and chemistry:

  • Carbonaceous chondrites generally have Mg/Si ratios near the solar value, and oxygen isotope compositions that plot below the terrestrial fractionation line.

  • Enstatite chondrites generally have sub-solar Mg/Si and refractory/Si ratios, oxygen isotope compositions that plot near the terrestrial fractionation line, and highly reduced mineral assemblages containing little FeO, Si-bearing metal, and sulfides of elements normally considered lithophile.

    • EH chondrites are a high-iron chemical group distinguished by small chondrules.

    • EL chondrites are a low-iron chemical group distinguished by moderately large chondrules.