| 词汇 | mica |
| 释义 | mica noun[ U ] uk /ˈmaɪ.kə/ us /ˈmaɪ.kə/ a natural substance like glass that breaks easily into thin layers and is not damaged by heat, often used in electrical equipment云母 Geology: mineralogy beneficiation crystal crystalline deposit gemologist gemology gold dust graphite idiomorphic intercrystalline magnesium mineral nugget pyrite quasicrystal seam silicon unmined vermiculite vulcanicity Examples of micamica It is typically defined by the shapepreferred orientation of mica and elongated quartz grains. Controlled deposition of lipid monolayers and bilayers onto mica and direct force measurements between galactolipid bilayers in aqueous-solutions. The larger modelled upper continental crust component is also consistent with the relative abundance of detrital mica of possible extra-basinal origin. The siltstones commonly contain detrital white mica flakes that are generally lacking in the sandstones, and are possibly of distal continental origin. Low-temperature, fine-grained, alteration products include serpentine, talc, bowlingite, white mica, epidote s. l., carbonate and opaques. Alteration is variable: absent in many crystals, in others producing dense sericite aggregates which may show some recrystallization effects to produce coarser-grained white mica. These are mica flakes 0.5pm thick, 5-20pm diameter, coated with titanium dioxide to raise their refractive index. The mica crystal reflectivity has not been taken into account for the calculations. Bedding surfaces may contain relatively coarse, heavily weathered, volcanic clasts, degraded ash particles and mica flakes. Electrical double layer structure revisited via a surface force apparatus : mica interfaces in lithium nitrate solutions. Up to now, the only accretion ice containing mica-clay sediments allowed the recovery of a few bacterial phylotypes. The lower part of the metamorphic sole is composed of kyanite and garnet-bearing mica schist, mica schist, quartzite and marble. The fine-grained, low-temperature alteration paragenesis includes chlorite, white mica, epidote s. l., titanite and prehnite. All other phases use similar activity models except for white mica and garnet. The lower part of the formation is often metamorphosed and deformed into strongly magnetic mica schists. 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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