Origin of chert
Examples from the Web for chert
Seven specimens were of basalt and one each of chert and porphyry.
Most examples from this area are made from Ft. Payne chert, which is usually patinated to a chocolate brown color.Handbook of Alabama Archaeology: Part I Point Types|James W. Cambron
He mun ha' summut to prop his ribs out, lass, as he delves through th' chert and tood-stone.
The materials include basalt, chert, chalcedony, and obsidian.
As seen on a polished slab of chert from the sand of the Upper Oolite, Tisbury.A Manual of Elementary Geology|Charles Lyell.
British Dictionary definitions for chert
Word Origin for chert
Word Origin and History for chert
"flint-like quartz," 1670s, of unknown origin. Apparently "a local term, which has been taken into geological use" [OED].