argillite

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argillite

[′är·jə‚līt]
(petrology)
A compact rock formed from siltstone, shale, or claystone but intermediate in degree of induration and structure between them and slate; argillite is more indurated than mudstone but lacks the fissility of shale.

argillite

A rock containing chiefly clay materials; derived from claystone, siltstone, or shale; used locally as building stone, although rarely produced commercially.
References in periodicals archive ?
Akkerman also designed the configuration of the cutting heads specifically for the clay stone type material at the lake.
LEADING THE WAY: Artist Alan Vaughan with some of the clay stones he will use to create a new cobbled path for Belmont Green PICTURE: MIKE URWIN www.
On clay stones, the joints are the major problem and pre-cast copings should be looked at more carefully.