CoachThe petrologic type of a chondrite is a number from 1 to 6 that records what happened to it in its parent body: type 3 is the least altered; types 4 to 6 are increasingly heated, their chondrules blurred and their minerals recrystallised and of uniform composition; types 2 and 1 are increasingly altered by liquid water, which turned their minerals into clays.
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Earth and Space Sciences · 术语表