ˈclay-stone
† 1. ? Brick. Obs.
| c 1340 Cursor M. 5524 (Fairf.) Baþ clay stane and morter. |
2. Min. An earthy felspathic rock of igneous origin, and of various dull colours: the harder varieties were known as compact felspar. When breathed on it emits an odour of damp clay.
| 1777 G. Forster Voy. round World I. 149 A kind of brown talcous clay-stone..common to all New Zeeland. 1843 Portlock Geol. 153 A reddish coloured claystone, amygdaloid, very vesicular. 1850 Dana Geol. xiii. 584 The clay⁓stone has a dark greenish-brown colour. 1851 Mayne Reid Scalp Hunt. xx, Smoking out of curiously-carved pipes of the red clay-stone. 1876 Page Adv. Text-bk. Geol. vii. 134. |
3. Comb. clay-stone porphyry, a clay-stone of more crystalline texture.
| 1862 Ansted Channel Isl. ii. x. (ed. 2) 271 Shale, occasionally hardening into an exceedingly compact clay-stone, or clay-stone porphyry. |