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词汇 siderite
释义

Definition of siderite in English:

siderite

noun ˈsʌɪdərʌɪtˈsɪdərʌɪtˈsɪdəˌraɪt
  • 1mass noun A brown mineral consisting of ferrous carbonate, occurring as the main component of some kinds of ironstone or as rhombohedral crystals in mineral veins.

    菱铁矿

    Example sentencesExamples
    • The fine-grained sediment of the matrix is composed chiefly of siderite, with lesser amounts of illite, calcite, quartz, and bitumen.
    • Overgrowths of fine-grained, bronze-colored siderite are often present on selected faces of the fluorite crystals.
    • The color of the siderite is grayish-white when cleaned, but in most instances it is a dull to iridescent reddish-brown because of alteration to iron oxides on the crystal surfaces.
    • It was the largest orebody found in the Rocky Point zone of the Sawatch Quartzite; ores were of the zinc manto type with marmatite, argentiferous galena, pyrite, and siderite.
    • Of particular interest are superb specimens of lustrous, pale lavender fluorite crystals, many of which are associated with sphalerite and siderite from what remained of the flats surrounding the Diana vein.
  • 2A meteorite consisting mainly of nickel and iron.

    铁陨星,陨铁

    Example sentencesExamples
    • The date of formation is estimated to be about 5,000 years ago (Holocene), as a result of the impact of large elements of a siderite (iron meteorite), probably coming from the Perseids, which impact Earth during early August of each year.
    • On a hillside, three miles above the mouth of the Tualitin, fell, apparently centuries ago, the Willamette siderite, the third largest iron meteorite in the world.

Derivatives

  • sideritic

  • adjective ˌsʌɪdəˈrɪtɪkˌsɪdəˈrɪtɪkˌsɪdəˈrɪdɪk
    • Here, the Nancy sequence consists of 10 m of greenish-gray, silty mudstone and shale with scattered sideritic nodules.
      Example sentencesExamples
      • The dominant lithologies associated with the blue asbestos are banded magnetite-hematite-chert ironstones, stilpnomelanerich massive ironstone, and iron-silicate-bearing and sideritic banded ironstones.
      • The succession begins with a conspicuous brown sideritic crust above the last rich cheiloceratid fauna.
      • This system was drowned around maximum flooding and covered by mudstone which contains bored micrites, bioclastic limestones, sideritic nodules, encrusted pebbles and chamosite ooids.
      • At Montceau-les-Mines only five specimens of Amynilyspes have been found up to now out of 23,250 sideritic concretions that have yielded animal remains (coprolites excluded).

Origin

Late 16th century (denoting lodestone): from Greek sidēros 'iron' + -ite1.

Definition of siderite in US English:

siderite

nounˈsɪdəˌraɪtˈsidəˌrīt
  • 1A brown mineral consisting of ferrous carbonate, occurring as the main component of some kinds of ironstone or as rhombohedral crystals in mineral veins.

    菱铁矿

    Example sentencesExamples
    • Overgrowths of fine-grained, bronze-colored siderite are often present on selected faces of the fluorite crystals.
    • The fine-grained sediment of the matrix is composed chiefly of siderite, with lesser amounts of illite, calcite, quartz, and bitumen.
    • Of particular interest are superb specimens of lustrous, pale lavender fluorite crystals, many of which are associated with sphalerite and siderite from what remained of the flats surrounding the Diana vein.
    • It was the largest orebody found in the Rocky Point zone of the Sawatch Quartzite; ores were of the zinc manto type with marmatite, argentiferous galena, pyrite, and siderite.
    • The color of the siderite is grayish-white when cleaned, but in most instances it is a dull to iridescent reddish-brown because of alteration to iron oxides on the crystal surfaces.
  • 2A meteorite consisting mainly of nickel and iron.

    铁陨星,陨铁

    Example sentencesExamples
    • The date of formation is estimated to be about 5,000 years ago (Holocene), as a result of the impact of large elements of a siderite (iron meteorite), probably coming from the Perseids, which impact Earth during early August of each year.
    • On a hillside, three miles above the mouth of the Tualitin, fell, apparently centuries ago, the Willamette siderite, the third largest iron meteorite in the world.

Origin

Late 16th century (denoting lodestone): from Greek sidēros ‘iron’ + -ite.

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