Relating to, containing, or having the characteristics of argillite or clay-based rocks.
Derived from 'argillite' + '-ic' (adjective suffix meaning 'of or relating to'). Follows the standard geological naming pattern where rock types get the '-ic' suffix to describe related materials.
Geologists use this word to describe rocks that behave like clay even if they're technically not pure clay—it's like saying something is 'clay-like' in scientific terms.
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