noun[mass noun] Geology
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.
- 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.
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