A type of coal that is bright and glossy, containing compressed plant materials that give it a distinct banded appearance.
From Latin 'clarus' (bright) + German '-in' (coal type suffix), used since the 1800s in geology to describe this particular coal classification.
Coal has its own taxonomy based on appearance—clarain is the 'pretty one' with shiny bands, while dull vitrain is like coal's goth cousin!
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