chert

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chert:

see flintflint,
variety of quartz that commonly occurs in rounded nodules and whose crystal structure is not visible to the naked eye. Flint is dark gray, smoky brown, or black in color; pale gray flint is called chert.
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Chert

 

a mineral formation consisting of crystalline and amorphous silica (opal, chalcedony, or quartz). Chert is widespread in nature in the form of concretions, nodules, and seams that either lie parallel with the enclosing limestone and chalk deposits or cut across bedding. It is formed either by diagenesis of deposits, by catagenesis of rocks, or by weathering. It has a hardness of 7 on the mineralogical scale and breaks with a conchoidal fracture. Because of its ability to form a sharp cutting edge when chipped, chert (flint) was used by man from the most ancient times to the Iron Age to make stone tools.

chert

[chərt]
(petrology)
A hard, dense, sedimentary rock composed of fine-grained silica, characterized by a semivitreous to dull luster and a splintery to conchoidal fracture; commonly gray, black, reddish brown, or green. Also known as hornstone; phthanite.

chert

A very fine-grained dense rock consisting of chalcedony or opal, often with some quartz, and sometimes with calcite, iron oxide, organic matter, or other impurities; has a homogeneous texture and white, gray, or black color; some of its constituents may react with cement alkalies and therefore may be undesirable as concrete aggregate for exposed concrete in northern climates.
References in periodicals archive ?
Latif (1972) designated this dominantly clastic sequence comprising of siltstone and sandstone with subordinate cherty dolomite as the Kakul Formation with a total thickness of ~250 m.
Within polished mounts of heavy liquid separates of samples of cherty sandstone from the 5,280 level, chalcopyrite has been observed as a minor constituent.
Matseevich, "Naibolee vazhnye cherty sovremennoi obshchestvennoi agronomii," Agronomicheskii zhurnal, no.
The mrazekite-bearing skarn occurs at the top of one of the limestone lenses and beneath a cherty siltstone band.
(25) In 1947, Vladimir Kemenov published his theory of two cultures, in which he attacked the modern art movement and asserted the cultural superiority of Soviet Socialist Realism ("Cherty dvukh kul'tur," VOKS Bulletin, no.
(29) Denis Davydov, "Nekotorye cherty iz zhizni Denisa Vasil'evicha Davydova," in his Sochineniia (Moscow: Gosudarstvennoe izdatel'stvo khudozhestvennoi literatury, 1962), 36.
"Kharakternyye cherty raspada kolonial'noy sistemy imperializma v Afrike" [The distinctive features of the collapse of the colonial system of imperialism in Africa].
1400 Ma dolomite (Gaoyuzhuang Formation), 1310-1207 Ma cherty dolomite (Wumishan Formation), and Cambrian-Ordovician limestone (Mantou Formation and Zhangxia Formation) and a Mesozoic sequence of volcanic-sedimentary rocks (Tiaojishan Formation).
The studied succession consists of 7 lithofacies expanded from Barnolas and Simo (1987) including: boulder-pebble conglomerates, graded pebble conglomerates, graded peloidal-ooid packstones, graded oolites, calcilutites, Posidonia coquina and cherty mudstones.
SATURDAY'S SOLUTION: chert; cherty; chip; chirp; chirpy; chit; choir; chop; chore; chypre; cipher; echo; echt; ephor; epoch; etch; ethic; hector; heir; heriot; hero; heroic; hire; hoer; hope; hoper; hype; hyper; hypo; HYPOCRITE; ichor; itch; itchy; oche; ochre; ochry; other; perch; phot; photic; pitch; pitcher; pitchy; pith; pithy; porch; pother; retch; rhotic; rich; rochet; tech; techy; theory; thorp; thrice; thrip; tich; torch; trophic; trophy.