1) Dull-colored flintlike quartz 2) Fine-grained silica 3) Flintlike quartz 4) Flintlike rock 5) Flintlock rock 6) Quartz 7) Rock like flint 8) Rock made mainly of silica 9) Silica 10) Silicon dioxide 11) Silicon oxide 12) Variety of silica
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1) Taconite
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https://www.crosswordclues.com/clue/chert
Chert (t) is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils. It varies greatly in color (from white to black), but most often manifests as gray, brown, grayish brown and light green to rusty red; its color is an expression of trace elements present in the rock, and bot...
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http://en.wikipedia.org/wiki/Chert
fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils.
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http://en.wikipedia.org/wiki/Glossary_of_geology
• (n.) An impure, massive, flintlike quartz or hornstone, of a dull color.
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http://thinkexist.com/dictionary/meaning/chert/
Chert. Credit: U.S. Geological Survey A variety of quartz, always massive, not unlike flint, but more brittle, breaking with a splintery fracture. It is common in limestones of the Paleozoic era, but also occurs in Mesozoic strata (Jurassic, Cretaceous), sometimes forms rocks, and often contain...
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http://www.daviddarling.info/encyclopedia/C/chert.html
Microcrystalline silica (SiO2). Flint is the best known example.
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http://www.encyclo.co.uk/local/20206
A type of stone similar to flint - though more variable in colour and quality. It may be subjected to knapping. It has been used the same way as flint - though they are many local sources of this in clays along the coast and in glacial gravels. Types of agate were also used in the absence of flint.
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http://www.encyclo.co.uk/local/20766
A 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 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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Silicon dioxide (SiO
2); a compact, massive rock composed of minute particles of quartz and/or chalcedony; it is similar to flint but lighter in color.
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http://www.encyclo.co.uk/local/22047
A member of a group of sedimentary rocks that consist primarily of microscopic silica crystals. Chert may be either organic or inorganic, but the most common forms are inorganic.
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http://www.encyclo.co.uk/local/22291
A microcrystalline or cryptocrystalline sedimentary rock material composed of SiO2. Occurs as nodule
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http://www.encyclo.co.uk/local/22392
A 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 and projectile by chipping. It has often been called flint, but true flint is found in chalk deposits and is a distinctive blackish color. In North America,......
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http://www.encyclo.co.uk/visitor-contributions.php
a type of stone favored for knapping stone tools and projectile points because of its structure and predictable fracturing characteristics
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http://www.encyclo.co.uk/visitor-contributions.php
Chert (chẽrt)
noun [ Ir.
ceart stone, perhaps akin to English
crag .]
(Min.) An impure, massive, flintlike quartz or hornstone, of a dull color.
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http://www.encyclo.co.uk/webster/C/61
A sedimentary rock composed of granular cryptocrystalline silica.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
A 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. It may form from deposition and compaction of silica-rich skeletons of diatoms, radiolarians (a common ocean planktonic animal), and tiny sponge frag...
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http://www.fossilmall.com/Science/Glossary.htm
Chert (hornstone) is a mineral very similar to flint, but coarser and less uniform in colour. It is found principally in association with limestones, especially in the carboniferous limestone of Ireland where beds of it are found several hundred feet thick. It appears to have resulted from the solution and redeposition of the silica of certain kind...
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http://www.probertencyclopaedia.com/browse/HC.HTM
A dense sedimentary rock, composed of interlocking quartz crystals and possibly amorphous silica (opal). The origin of the silica is normally biological, from diatoms, radiolaria or sponge spicules. Synonymous with flint.
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http://www.scientificpsychic.com/etc/geology-glossary.html
Hard, dense sedimentary rock, composed of interlocking quartz crystals and possibly amorphous silica (opal). The origin of the silica is normally biological, from diatoms, radiolaria or sponge spicules. Synonymous with flint.
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http://www.ucmp.berkeley.edu/glossary/gloss2geol.html
Hard, dense sedimentary rock, composed of interlocking quartz crystals and possibly amorphous silica (opal). The origin of the silica is normally biological, from diatoms, radiolaria or sponge spicules. Synonymous with flint.
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http://www.ucmp.berkeley.edu/glossary/glossary_2.html
[
n] - variety of silica containing microcrystalline quartz
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http://www.webdictionary.co.uk/definition.php?query=chert
noun variety of silica containing microcrystalline quartz
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https://www.encyclo.co.uk/local/20974
A cryptocrystalline form of quartz, microscopically granular. Occurs as nodules and as thin, continuous layers. Duller, less waxy luster than
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https://www.encyclo.co.uk/local/22327
a compact rock consisting essentially of microcrystalline quartz.
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https://www.infoplease.com/dictionary/chert
No exact match found.
