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chertA sedimentary rock and a variety of quartz made of extremely fine-grained, or cryptocrystalline, silica, also called chalcedony. The silica might be of organic origin, such as from the internal struct [..]
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chertA cryptocrystalline form of quartz, microscopically granular. Occurs as nodules and as thin, continuous layers. Duller, less waxy luster than
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chert"flint-like quartz," 1670s, of unknown origin. Apparently "a local term, which has been taken into geological use" [OED].
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chertFine-grained, usually dark-colored sedimentary rock of silica-rich composition.
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chertA fine-grained sedimentary rock, similar to flint, that is white, pinkish, brown, gray, or blue-gray in color. In antiquity, chert was one of the universally preferred materials for making stone tools [..]
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cherthard and dense sedimentary rock, light gray to dark gray (flint), composed of quartz crystals and silica derived from marine fossils. Usually found in limestone nodules.
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chertA cryptocrystalline form of quartz, microscopically granular. Occurs as nodules and as thin, continuous layers. Duller, less waxy luster than chalcedony. Occurs in limestone, dolostone, and mudstones. [..]
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chertVery fine grained silica (SiO2
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chertA cryptocrystalline form of quartz, microscopically granular. Occurs as nodules and as thin, continuous layers. Duller, less waxy luster than chalcedony. Occurs in limestone, dolostone, and mudstones.
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cherta hard flinty rock composed mainly of siliceous microfossils
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chert(n) variety of silica containing microcrystalline quartz
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chertA very fine-grained sedimentary rock
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chertA hard variety of sedimentary rock, similar to flint. It breaks in a predictable fashion which made it highly desirable for prehistoric toolmakers.
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chertA very fine-grained sedimentary rock made of quartz. Usually made of millions of globular siliceous skeletons of tiny marine plankton called radiolarians. Black chert is called flint.
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chertA sedimentary rock composed of extremely fine-grained quarts, formed by organic or inorganic precipitation or by replacement. Flint and jasper are varieties of chert. Chockstone A rock or boulder wedged into a narrow canyon.
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chertA very fine-grained rock formed in ancient ocean sediments. It often has a semi glossy finish and is usually white, pinkish, brown, gray, or blue gray in color. It can be shaped into arrowheads by chipping. It has often been called flint, but true flint is found in chalk deposits and is a distinctive blackish color.
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chertA fine-grained sedimentary rock rich in quartz and usually light in colour. Chert is similar to flint, and was often used in the manufacture of stone tools.
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chertA compact cryptocrystalline or microcrystalline variety of quartz originating from a sedimentary context.
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chert
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chertsedimentary rock that is ultra–fine grained and composed almost entirely of silica. May be of organic or inorganic origin.
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chertsmooth form of black quartz chimera
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chertFine grained quartz rock usually occurring as thin layers in sedimentary sequences.
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chertA type of stone similar to flint
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chertA type of fine-grained, silica-rich rock often found in limestone. Native Americans shaped chert by carefully striking it with stone or bone hammers.
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chertsee lithic materials
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chertRock similar to flint. It can be knapped but is mostly of lower quality. Chert is usually found in shades of white, pink, brown and grey. Lots of Chert found in the Lower Thames Valley, UK
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cherta very fine grained rock formed in ancient ocean sediments. It often has a semi-glassy finish and is usually white, pinkish, brown, gray or blue-gray in colour. It can be shaped into arrowheads by chipping. It has often been called flint, but true flint is found in chalk deposits and is a distinctive blackish colour.
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chert
(geology,uncountable) Massive, usually dull-colored and opaque, quartzite, hornstone, impure chalcedony, or other flint-like mineral.
(countable) A flint-like tool made from chert.
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