argils

Here we find greenstone breccia'd with the blackest hornblende; there huge filons of hard, red, heat-altered clays, faced with iron, whilst the fracture is white as trachyte; and there filets of quartz, traversing large curtains and sheets of light-coloured argils.

The Land of Midian — Volume 2 Richard Francis Burton 1855

_argils_ or _argillæ_, but suppose them to be calculated for the requirements of a more advanced state of society than that of the dwellers in Picts 'houses.

Notes and Queries, Number 183, April 30, 1853 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc Various 1852

Here we find greenstone breccia’d with the blackest hornblende; there huge filons of hard, red, heat-altered clays, faced with iron, whilst the fracture is white as trachyte; and there filets of quartz, traversing large curtains and sheets of light-coloured argils.

The Land of Midian 2003