Resembling or having characteristics similar to clay or argillite, with fine-grained sedimentary properties.
From Latin 'argilla' (clay) + Greek '-oid' (resembling, having the form of). A general term describing clay-like appearance without necessarily being pure clay.
Using 'argilloid' lets geologists describe rocks that *act* like clay and *look* like clay without committing to whether they're technically clay—it's the 'clay-ish' of geology!
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