| 词汇 | silica |
| 释义 | silica noun[ U ] uk /ˈsɪl.ɪ.kə/ us /ˈsɪl.ɪ.kə/ a mineral that exists in various forms, including sand, quartz, and flint, used to make glass and cement硅石，二氧化硅 Geology: types of rock agglomerate arenaceous arenite asthenosphere asthenospheric emery flinty gneiss indurated intrusive lahar limestone lodestone magma marcasite marl marmoreal obsidian sandstone schist Examples of silicasilica Conodonts and brachiopods are usually preserved as moulds or replaced by silica. The silica 'fusion crust' from the associated sample holder exhibited a significant degree of isotopic exchange with atmospheric oxygen during re-entry1. The air was dried to zero relative humidity by passing it through two columns of silica gel. The results are shown in table 1 together with some physical properties of the silica dusts. The ostracod valves recovered have been replaced by finely to coarsely crystalline silica, which has preserved the original morphology and in some cases the ornament. The two planes intersect along cd which is the locus of liquids in equilibrium with a silica polymorph + two feldspars + aqueous fluid. Small amounts of calcite and dolomite can appear sporadically in silica xenoliths, but are more common in calc-silicate xenoliths. Seeds were dried for 2 weeks over silica gel before sugar extraction. The major-element geochemistry confirms the very high levels of silica in all the clasts analysed, and their general granitic nature. The section on the silica minerals covers 152 pages (in the first edition it was 52 pages), including 25 pages of references. This book is aimed at this popular market and is lavishly illustrated, but also contains something for the professional interested in the formation of silica. In these veins, very high degrees of fractional crystallization are reached, producing interstitial silica-rich glasses. However, they are probably mainly composed of silica and are postulated to have a similar origin to category 1a types. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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