In contrast, carbonaceous chondrites are enriched in the abundances of carbon, sulfur, water, and other volatile compounds than the other chondrite classes. This indicates the most primitive chemical characteristic among the classes of chondrites mentioned earlier. Thus, one of the subclasses of carbonaceous chondrites, represented by Carbonaceous Ivuna (CI) chondrite, has been regarded to represent the chemical composition of the solar system. This is supported by the fact that the composition of CI chondrites is most similar to that of the sun determined by spectrographically except noncondensing elements and lithium (White, 2013). The chemical composition of the CI chondrite shows that the abundance of REEs in the earth follows Oddo–Harkins effect that the elements with even atomic number are more stable and abundant than the neighboring elements of the odd atomic number, and the lighter REEs are more abundant than the heavier ones (Table 3 and Fig. 4).
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In contrast, carbonaceous chondrites are enriched in the abundances of carbon, sulfur, water, and other volatile compounds than the other chondrite classes. This indicates the most primitive chemical characteristic among the classes of chondrites mentioned earlier. Thus, one of the subclasses of carbonaceous chondrites, represented by Carbonaceous Ivuna (CI) chondrite, has been regarded to represent the chemical composition of the solar system. This is supported by the fact that the composition of CI chondrites is most similar to that of the sun determined by spectrographically except noncondensing elements and lithium (White, 2013). The chemical composition of the CI chondrite shows that the abundance of REEs in the earth follows Oddo–Harkins effect that the elements with even atomic number are more stable and abundant than the neighboring elements of the odd atomic number, and the lighter REEs are more abundant than the heavier ones (Table 3 and Fig. 4).