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siliceous deposits GEOL

siliceous flux METALL

siliceous iron ore METALL

Esempi monolingue (non verificati dalla Redazione di PONS)

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These sediments consist of eolian quartz, clay minerals, volcanic ash, subordinate residue of siliceous microfossils, and authigenic minerals such as zeolites, limonite and manganese oxides.
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Limestone soil produces wines with a dusky red hue, whereas those grown in siliceous soil take on a redcurrant shade.
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It consists of siliceous siltstones, formed in deep water.
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Note that not all tests are calcareous; diatoms and radiolaria have siliceous tests.
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The body is composed entirely of silica in the form of 6-pointed siliceous spicules, which is why they are commonly known as glass sponges.
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It is found in the crevices of fractured siliceous rock.
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Soapstone is formed by the metamorphism of ultramafic protoliths ("e.g." dunite or serpentinite) and the metasomatism of siliceous dolostones.
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The surface soil is clay in which are embedded fragments of siliceous sandstone, used for millstones and constructional purposes; the subsoil is limestone.
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It occurs in hornfels and siliceous marble xenoliths within and adjacent to a nepheline syenite intrusion.
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The soil is cool, as often chalky as siliceous (rich in silica), and nearly always acidified by rain.
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