The lutites or pelites are sedimentary rocks detrital whose elements have a diameter lower than 1/16 mm (less than 0,0625 mm). One calls also lutites the particles of movable rocks whose diameter is of less than 0,0625 Misters.

It is appeared as a rock Argile uses and has a strong holding capacity to the Eau but a low permeability in general.

See too

• Granulometry