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phlogopite

phlogopite

phlogopite Sentence Examples

  • Calc-schists are usually argillaceous limestones in which a large development of biotite or phlogopite has occasioned foliation.

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  • The principal members of the group are muscovite, biotite, phlogopite and lepidolite.

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  • The angle between the optic axes varies from 70 0 -50° in muscovite and lepidolite to Io - o° in biotite and phlogopite; the latter are thus frequently practically uniaxial.

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  • To the first class, with the optic axial plane perpendicular to the plane of symmetry, belong muscovite, lepidolite, paragonite, and a rare variety of biotite called anomite; the second class includes zinnwaldite, phlogopite, lepidomelane and most biotites.

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  • Muscovite and biotite are commonly found in siliceous rocks, whilst phlogopite is characteristic of calcareous rocks.

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  • The commercially valuable micas of Canada and Ceylon are mainly phlogopite (q.v.), which has a rather different mode of occurrence.

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  • Muscovite and phlogopite are practically the only species used commercially, the former being the more common.

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  • Phlogopite is rarely found as colourless transparent sheets and is therefore almost exclusively used for electrical purposes.

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  • At Moriah and Port Henry, in Essex county, is a stone known as ophlite marble, a mixture of serpentine, dolomite and calcite interspersed with small flecks of phlogopite.

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  • Other minerals present include diopside, pargasite, spinel, phlogopite, apatite, graphite, pyrrhotite and zircon (Davidson 1943 ).

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  • Calc-schists are usually argillaceous limestones in which a large development of biotite or phlogopite has occasioned foliation.

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  • The principal members of the group are muscovite, biotite, phlogopite and lepidolite.

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  • The angle between the optic axes varies from 70 0 -50° in muscovite and lepidolite to Io - o° in biotite and phlogopite; the latter are thus frequently practically uniaxial.

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  • To the first class, with the optic axial plane perpendicular to the plane of symmetry, belong muscovite, lepidolite, paragonite, and a rare variety of biotite called anomite; the second class includes zinnwaldite, phlogopite, lepidomelane and most biotites.

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  • Minute acicular inclusions, probably of rutile, arranged parallel to the rays of the percussion figure, give rise to the phenomenon of "asterism" in some micas, particularly phlogopite: a candle-flame or spot of light viewed through a cleavage sheet of such mica appears as a six-rayed star.

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  • Muscovite and biotite are commonly found in siliceous rocks, whilst phlogopite is characteristic of calcareous rocks.

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  • The commercially valuable micas of Canada and Ceylon are mainly phlogopite (q.v.), which has a rather different mode of occurrence.

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  • Muscovite and phlogopite are practically the only species used commercially, the former being the more common.

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  • Phlogopite is rarely found as colourless transparent sheets and is therefore almost exclusively used for electrical purposes.

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  • At Moriah and Port Henry, in Essex county, is a stone known as ophlite marble, a mixture of serpentine, dolomite and calcite interspersed with small flecks of phlogopite.

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