Online Google Dictionary

chert 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/CHərt/,/CHat/,
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cherts, plural;
  1. A hard, dark, opaque rock composed of silica (chalcedony) with an amorphous or microscopically fine-grained texture. It occurs as nodules (flint) or, less often, in massive beds

  1. variety of silica containing microcrystalline quartz
  2. Chert is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils. ...
  3. Massive generally dull colored and usually opaque quartzite or hornstone or impure chalcedony or other flint-like mineral. By general usage in mineralogy and geology, a chert does not have a conchoidal fracture. ...
  4. Chert is a hard, dense, fine-grained type of sedimentary rock, a crystalline aggregate of silica (quartz). It was formed from deposits of silica-based skeletons of microscopic marine organisms (including zooplankton like diatoms, radiolarians, plus sponge spicules and other organic matter). ...
  5. 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.
  6. (2) -- a form of amorphous silica found in several varieties, e.g. flint (Oxford Dict.)
  7. Chert is the stable database format used in Xapian 1.2.x. It is similar to Flint in many ways, but generally faster, and uses significantly less disk space. Chert is very efficient and highly scalable. ...
  8. Proper name for what most Texans call flint, but both terms are used interchangeably by most people, including Texas Beyond History writers. ...
  9. Rock. Hard, amorphous silica found in concretions and beds, often replaces other materials, often reddish or yellowish. Often used by native people to make stone tools.
  10. a type of rock or stone, similar to flint, used to make chipped stone tools.
  11. A 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 (obsidian was another).
  12. rock composed of authigenic microcrystalline quartz; chert can form by the replacement of limestone and by recrystallization of opaline sediments.
  13. a generally impure and commonly coarse form of quartz. Chert is usually brown, grey or black and opaque although some specimens may be translucent along a thin edge.
  14. A member of a group of sedimentary rocks that consist primarily of microscopic silica crystals.
  15. a mainly opaque, fairly granular, silicate rock with a dull shiny luster and a great range of colors, used as raw material for the manufacture of chipped stone artifacts. Varieties include jasper and flint.
  16. Rock 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
  17. A dense, very hard rock composed of microcrystalline silica (varieties also called flint, jasper, agate)
  18. A dull-colored, subtranslucent rock resembling flint that was often used for making flaked stone tools.
  19. Very fine grained silica (SiO2) that forms layers or nodules in sequences of sedimentary rocks.
  20. 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 by chipping. ...
  21. a very fine-grained siliceous rock characterized by hardness and conchoidal fracture in dense varieties, the fracture becoming splintery and the hardness decreasing in porous varieties, and in a variety of colors; it is composed of silica in the form of chalcedony, cryptocrystalline or ...
  22. A cryptocrystalline form of silica found as nodules, etc., in limestones and often weathered out as projections from walls or forming pebbles on the floors of caves.
  23. A hard, extremely dense or compact, dull to semi-glassy rock where you can not see the crystals. You can not typically see through the rock, however, sometimes it is slightly see-through. The color is highly variable. ...
  24. a type of rock made up mostly of silica (a mineral), but not made up of fragments of pre-existing rock; this category includes chalcedony. Chert tends to have very tiny crystals or none at all and therefore flakes well.
  25. The geologist played poker, but wound up losing his chert.