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.
This relatively thick pipe was selected to accommodate the high jacking pressures expected because of the swelling properties of the clay stone.
Some ground subsidence is expected over long periods of time but this would be absorbed by the elastic nature of the clay stone.
The landfill sealing method described here was conceived and has been developed specifically for Munchehagen and the clay stone, containing fissures and other planes of weakness, in which the waste has been deposited.
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.