Chalk or a chalk-like mineral, especially a white or pale sedimentary rock used in various applications.
Variant of 'chalk', from Old English 'cealc' derived from Latin 'calx' (limestone). This older spelling persists in some dialects and historical texts.
Before modern manufacturing, finding good 'cauk' or chalk deposits was valuable—farmers used it to mark fields, teachers wrote with it, and builders used it as a binding material, making it one of history's most useful white rocks.
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