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Chert
| Глоссарий по архитектуре и конструкциям |
- 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.
- A hard, extremely dense or compact, dull to semivitreous, cryptocrystalline sedimentary rock, consisting dominantly of interlocking crystals of quartz less than about 30 mm in diameter; it may contain amorphous silica (opal). it sometimes contains impurities such as calcite, iron oxide, or the remains of siliceous and other organisms. it has a tough, splintery to conchoidal fracture and may be white or variously colored gray, green, blue, pink, red, yellow, brown, and black. chert occurs principally as nodular or concretionary segregations in limestones and dolomites. gg
- Hard, dense, dull to slightly shiny, cryptocrystalline sedimentary
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Кремень, русский
- Кремень , камень , человек-кремень
- , минеральное образование, состоящее из кварца и халцедона. желто-бурые до черных конкреции, желваки, главным образом в известняках, меле и мергелях. твердость ок. 7. в древности - материал для каменных орудий. применяется при изготовлении эмалей и глазурей, для шлифования и др.
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Chalcedony, английский
- A submicroscopic variety of fibrous quartz, generally translucent and containing variable amounts of opal; reacts with alkalies in portland cement. chalcidicum, chalcidic 1.a portico, or hall supported by columns, or any addition of like character connected with any ancient basilica;
- Халцедон
- Silica mineral which is the cryptocrystalline variety of quartz. has a
Impurities, английский
Elements or compounds whose presence in a material is undesired.
Homogeneous, английский
- Гомогенный, однородный номок уел nondirectional radio beacon resumed operation ненаправленный радиомаяк возобновил работу
- A однородный
- Гомогенный; однородный
- Exhibiting a high degree of homogeneity.
- The same or similar
- The same or similar description of a group whose members are all the same or similar (for example, people from the same background and heritage). opposite of heterogeneous host-country nationals
Undesirable, английский
Semivitreous, английский
Cryptocrystalline, английский
- A rock texture that is too fine to be discernible with an optical microscope.
- Textural term for a rock consisting of crystals that are too small to be
Sedimentary, английский
Interlocking, английский
- A general term applied to equipment that controls setting and releasing signals and points to prevent an unsafe condition of the signalling system arising during the passage of a train.
- Блокировка; блокирование; запирание
- Being joined or connected so that neither part can be operated
- In signalling, a system to prevent the setting up of conflicting routes. at first they were mechanical, then electro-mechanical. now they are largely computerised using a two in three voting system or similar protocol. also note the term ssi (solid state interlocking). in the us, the term interlocking refers to an area where junctions and signals are under the control of a signal cabin or "tower".
- Interlocking of points and signals, through the locking frame in the signal box, prevents the accidental setting up of conflicting routes.
Conchoidal, английский
A term used originally in descriptive mineralogy to describe the
Concretionary, английский
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Mineral dust, английский
A very finely divided mineral product, the greatest bulk of which will pass through a 74-micron (no. 200) sieve; the most common such material is pulverized limestone.
Slate powder, английский
A very fine powder obtained by pulverizing slate; used in paint as a dark-extender pigment.
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