| 释义 |
chert
chert C0277400 (chûrt)n.1. A variety of silica that contains microcrystalline quartz.2. A siliceous rock of chalcedonic or opaline silica occurring in limestone.
[Origin unknown.]
chert′y adj.chert (tʃɜːt) n (Minerals) a microcrystalline form of silica usually occurring as bands or layers of pebbles in sedimentary rock. Formula: SiO2. Varieties include flint, lyddite (Lydian stone). Also called: hornstone [C17: of obscure origin] ˈcherty adjchert (tʃɜrt)
n. a compact rock consisting essentially of microcrystalline quartz. [1670–80; orig. uncertain] chert′y, adj. chert (chûrt) A hard, brittle, reddish-brown to green sedimentary rock consisting of very small crystals of quartz.chertA type of sedimentary rock made up of of tiny quartz crystals.Thesaurus| Noun | 1. | chert - variety of silica containing microcrystalline quartztaconite - a variety of chert containing magnetite and hematite; mined as a low-grade iron oresilica, silicon dioxide, silicon oxide - a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite |
Translationschert
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.
..... Click the link for more information. .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. chertA 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.MedicalSeeFlintAcronymsSeeCHRTchert
Related to chert: Dolostone, micriteWords related to chertnoun variety of silica containing microcrystalline quartzRelated Words- taconite
- silica
- silicon dioxide
- silicon oxide
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