Definitions

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  • noun Plural form of felspar.

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Examples

  • The upper part of the Fiumara also showed abundant scatters of water-rolled stones, serpentines, and hard felspars, whose dove-coloured surface was streaked with fibrils and at times with regular veins of silvery lustre, as if brought out by friction of the surface.

    The Land of Midian 2003

  • If potassium and sodium are found in the chemical analysis, but the compounds are not water soluble, they may indicate the presence of fluxes such as the felspars or micas.

    Chapter 5 1984

  • Beyond this point the allowable thickness must depend on the nature of the rock; a good general rule is to get the section just so thin that felspars show the yellow of the first order in a polarising, microscope.

    On Laboratory Arts Richard Threlfall

  • It must be remembered, however, that it is only the orthoclase or potash felspars which contain large quantities of potash -- other felspathic rocks, such as oligoclase and labradorite, being comparatively poor in it.

    Manures and the principles of manuring Charles Morton Aikman

  • It is observed that different felspars undergo decomposition with different degrees of rapidity but after a certain time they all begin to lose their peculiar lustre, acquire a dull and earthy appearance, and at length fall into a more or less white and soft powder.

    Elements of Agricultural Chemistry Thomas Anderson

  • These reagents will attack the bisilicates and felspars.

    Getting Gold: a practical treatise for prospectors, miners and students

  • The flows from Kibo include nepheline and leucite basanite lavas rich in soda felspars.

    Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Various

  • According as these various felspars are present in a soil, so will the quality of the soil be.

    Manures and the principles of manuring Charles Morton Aikman

  • The name was afterwards applied by G. Tschermak to those plagioclase felspars which lie between labradorite and anorthite; and this has been generally adopted by petrologists.

    Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various

  • The felspars are composed of silica and alumina, along with potash, soda, and lime, with traces of iron and magnesia.

    Manures and the principles of manuring Charles Morton Aikman

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