siliceous material

См. также в других словарях:

• nicht kieselhaltiges Material — (n) eng non siliceous materials (pl) …   Arbeitssicherheit und Gesundheitsschutz Glossar

• sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …   Universalium

• placer mining — ☆ placer mining [plas′ər ] n. mining of placer deposits by washing, dredging, or other hydraulic methods * * * Oldest method of recovering gold from alluvial deposits. It takes advantage of gold s high density, which causes it to sink more… …   Universalium

• Bessemer process — Metall. a process of producing steel, in which impurities are removed by forcing a blast of air through molten iron. [1855 60; after H. BESSEMER] * * * Technique for converting pig iron to steel invented by Henry Bessemer in England in 1856 and… …   Universalium

• acid process — noun : a process carried on in a furnace lined with acidic or highly siliceous material and under a slag that is predominantly siliceous used especially of steelmaking processes; opposed to basic process * * * acid process, any steel making… …   Useful english dictionary

• opal — /oh peuhl/, n. 1. a mineral, an amorphous form of silica, SiO2 with some water of hydration, found in many varieties and colors, including a form that is milky white. 2. an iridescent variety of this that is used as a gem. 3. a gem of this. [1350 …   Universalium

• Opal — /oh peuhl/, n. a female given name. * * * A hydrated, noncrystalline silica mineral used extensively as a gemstone. Its chemical composition is similar to that of quartz but generally with a variable water content. Pure opal is colourless, but… …   Universalium

• tripoli — [trip′ə lē΄] n. [Fr, after Tripoli, town in Lebanon (or ? Libya), from which it was orig. imported] a usually light colored, very finely divided, essentially siliceous material consisting either of weathered chert or siliceous limestone: used as… …   English World dictionary

• Glen Canyon — Glen Canyon, in southeastern and south central Utah and northwestern Arizona within the Vermilion Cliffs area, was carved by the Colorado River.A reservoir, Lake Powell, was created by the Glen Canyon Dam. Lake Powell emerged from a struggle over …   Wikipedia

• diatomaceous earth —    1) [ geology ]    A lacustrine or marine geologic deposit of fine, grayish, siliceous material composed chiefly or wholly of the remains of diatoms. It may occur as a powder or a rigid material (i.e., diatomite).    GSST    2) [ Soil Taxonomy… …   Glossary of landform and geologic terms

• contact process — Chem. a catalytic method for producing sulfuric acid from sulfur dioxide and oxygen. [1900 05] * * * ▪ chemistry       modern industrial method of producing sulfuric acid; (sulfuric acid) it has largely replaced the chamber, or lead chamber,… …   Universalium