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Opaline chert
| Глоссарий по архитектуре и конструкциям |
Chert that is principally or entirely of opal.
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Chert, английский
- 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
Chert-arenite, английский
Chertification, английский
Cherty, английский
Opaline, английский
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Buildings in, английский
Chicago in the late 19th century. cheval-de-frise, pl. chevaux-de-frise sharply pointed nails or spikes set into the top of a barrier.
Reversion, английский
- Chemical reaction leading to the deterioration of a sealant, backup, or filler; due to moisture trapped behind the sealant.
- See: mean reversion.
- Страховка, выплачиваемая после смерти
- Инверсия
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