noun

• A sedimentary rock that does not split easily, formed from consolidated clay.

  ‘The Nelson mineral belt was rich in argillite, a dark stone which made fine tools.’

  More example sentences

  • ‘Bear images were carved into blocks of argillite, claystone, and wood or sculpted from clay, with the creative three-dimensional transformations displaying a remarkably naturalistic style.’
  • ‘Low water levels reveal carved layers of green and red argillite.’