The best samples of the solar nebula come from carbonaceous chondrite meteorites, which are abundant in volatiles.
One of the two categories of stony meteorites, the carbonaceous chondrite, is a diversified type of chondrites that is significant for the information it offers about the early solar system. They make up roughly carbonaceous chondrite 3% of all meteorites that were discovered after being seen to hit the planet. Based on the bulk chemistry, petrology, and volatiles oxygen isotopic compositions of carbonaceous chondrites, six recognized groups—CI, CM, CV, CO, CR, and CK—have been identified.
There have also been tentatively identified two other groupings, CH and CB. Except for the CI group, all chondrites, including carbonaceous chondrites, are mostly made up of chondrules and refractory inclusions volatiles embedded in a fine-grained matrix.
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