quartziten.

1823 tr. A. von Humboldt Geognostical Ess. Superposition Rocks 149 Compact quartz, or quartzites..belonging to granular limestone.

1849 R. I. Murchison Siluria viii. 167 The quartzites of the west are manifestly altered sandstones.

1880 W. B. Dawkins Early Man in Brit. vii. 181 There were also quartzite flakes and implements.

1895 J. D. Dana Man. Geol. (ed. 4) 137 A piece of quartzyte..divided up, or septated, by the oxidation process.

1924 Man 24 169 The large tools of the Sango types..are now known to occur practically wherever extensive beds of quartzite crop out.

1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) x. 238 Varieties named by color are chiefly the red quartzites which are ferruginous quartzites, and the white quartzites which are almost free from iron oxides.

1979 Sci. Amer. Mar. 43/3 Evidence includes ‘shatter cones’, structures of quartzite that flare outward and downward, away from the direction of [meteorite] impact.

2005 D. Cruickshank Around World in 80 Treasures 195 Then there is the quartzite sarcophagus—still in the tomb—and within that three coffins.

1849 Jrnl. Geol. Soc. Dublin 3 245 We not only find continual variations in the texture of the slates, a greater or less admixture of sandy particles, now become quartzitic, in larger or smaller crystals.

1937 Proc. Prehistoric Soc. 3 222 A small boulder of dark greenish-brown quartzitic sandstone.

2001 Amer. Antiq. 66 86/2 Neither these implements nor the projectile points of white quartzitic sandstone and Laguna chert were manufactured in Chaco Canyon.