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Examples ofsiderite
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Limonite/sideritenodules (up to 20 cm diameter) within sandstones are locally more abundant than in underlying units.
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This suggests the hematite crystals are not oxidation products ofsiderite, because pyrite is easily altered to goethite under an oxygenated atmosphere.
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This stage ofsideritecement is characterized with relatively rapid and irregular compositional zoning and minor dissolution phases.
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Most of the samples selected were dominated by one of thesideritephases although a few contained mixtures of two dominant phases.
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The member consists of coals, claystones and siltstones rich insideriteconcretions, and three to four levels of sandstone, each 2-10 m thick.
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Two periods of dissolution occurred between precipitation of different stages ofsideritecement.
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The resultant products were unreactedsiderite, magnetite and pyrrhotite.
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Figure 6a-d documents the transition zone of an inorganic, clay mineral-dominated layer to asideritelayer.
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During dehydration, fractures at the top and the bottom of the algal layer and at the transition zone of thesideritelayer are formed.
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Only samples containing major amounts ofsideritethat lacked other carbonate cement types were selected for stable isotope analysis.
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Attention is focused on thesiderite, and only a short description of the other diagenetic minerals is provided here.
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This paper suggests that tectonic activity can, by altering the hydraulic gradient, also influence pore water chemistry and lead to dissolution of cement, made clear by zoning withinsideritecrystals.
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The related ironstone beds contain low grade ooliticsideriteand chamosite ores which were worked commercially in the early 20th century.
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This example is from Wikipedia and may be reused under a CC BY-SA license.This process formedsideritein the sediments surrounding the remains, forming detailed casts of their structure.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Associated minerals include biotite and other micas, chlorite group minerals, quartz, zircon, certain feldspars, analcime, anatase, brookite, rutile,siderite, and apatite.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Associated minerals include metavivianite, ludlamite, pyrite,sideriteand pyrrhotite.
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Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.An example of a mineral in iron-rich rock containing carbonates issideriteand an example of minerals in an iron-rich rock containing silicate is chamosite.
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This example is from Wikipedia and may be reused under a CC BY-SA license.It is made by phyllites, quartzites, porphyrys and limestones commonly metamorphosed tosideriteand magnesite.
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This example is from Wikipedia and may be reused under a CC BY-SA license.They consist of concentric inter-bedded cones of calcite or more rarely gypsum,sideriteor pyrite.
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This example is from Wikipedia and may be reused under a CC BY-SA license.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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