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feldspar    音标拼音: [f'ɛldsp,ɑr]
n. 长石

长石

feldspar
n 1: any of a group of hard crystalline minerals that consist of
aluminum silicates of potassium or sodium or calcium or
barium [synonym: {feldspar}, {felspar}]

Feldspar \Feld"spar`\, Feldspath \Feld"spath`\, n. [G.
feldspath; feld field spath spar.] (Min.)
A name given to a group of minerals, closely related in
crystalline form, and all silicates of alumina with either
potash, soda, lime, or, in one case, baryta. They occur in
crystals and crystalline masses, vitreous in luster, and
breaking rather easily in two directions at right angles to
each other, or nearly so. The colors are usually white or
nearly white, flesh-red, bluish, or greenish.
[1913 Webster]

Note: The group includes the monoclinic (orthoclastic)
species orthoclase or common potash feldspar, and the
rare hyalophane or baryta feldspar; also the triclinic
species (called in general plagioclase) microcline,
like orthoclase a potash feldspar; anorthite or lime
feldspar; albite or soda feldspar; also intermediate
between the last two species, labradorite, andesine,
oligoclase, containing both lime and soda in varying
amounts. The feldspars are essential constituents of
nearly all crystalline rocks, as granite, gneiss, mica,
slate, most kinds of basalt and trachyte, etc. The
decomposition of feldspar has yielded a large part of
the clay of the soil, also the mineral kaolin, an
essential material in the making of fine pottery.
Common feldspar is itself largely used for the same
purpose. Feldspathic


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  • Feldspar - Encyclopedia. com
    Feldspar Feldspar is the most common mineral on Earth [1], constituting approximately 60% of the crust It forms directly from cooling magma and is a major component of granite and most other igneous rocks
  • feldspars - Encyclopedia. com
    feldspars The most important group of rock-forming silicate minerals, including the alkali feldspars KAlSi 3 O 8 to NaAlSi 3 O 8 (K-feldspar to albite) and the plagioclase feldspars NaAlSi 3 O 8 to CaAl 2 Si 2 O 8 ( albite to anorthite) The potassium, sodium, and calcium end-members can be taken to represent the three apices of an equilateral triangle into which all the alkali feldspars and
  • albitization | Encyclopedia. com
    albitization The partial or complete replacement of pre-existing plagioclase feldspar or alkali feldspar by albite There are a number of ways in which this can be achieved Source for information on albitization: A Dictionary of Earth Sciences dictionary
  • Plagioclases | Encyclopedia. com
    plagioclase feldspar One of the most important rock-forming silicate minerals with the general formula (Na,Ca) (Al) 1–2 (Si) 2–3 O 8 There is a solid solution series (see PLAGIOCLASE SERIES) between the two end-members albite (Ab) (NaAlSi 3 O 8) and anorthite (An) (CaAl 2 Si 2 O 8), and the percentage of calcium end-member present is used to subdivide the series into a number of
  • alkali feldspar - Encyclopedia. com
    alkali feldspar A group of silicate minerals that contain the alkali metal elements potassium and sodium The normal feldspar minerals (including the calcium-bearing varieties) can be plotted on a chemical basis into a triangle which has KAlSi 3 O 8 (potassium feldspar, sanidine, orthoclase (Or), or microcline), NaAlSi 3 O 8 (sodium feldspar, albite, or Ab), and CaAl 2 Si 2 O 8 (calcium
  • augen-gneiss | Encyclopedia. com
    augen-gneiss A medium- to coarse-grained, banded, regional metamorphic rock composed mainly of quartz and feldspar with hornblende and mica also present in variable quantities, and characterized by large ovoidal megacrysts of feldspar known as ‘augens’ (derived from the German for ‘eyes’)
  • Granite | Encyclopedia. com
    Granite Granite, which makes up 70 – 80% of Earth 's crust , is an igneous rock formed of interlocking crystals of quartz , feldspar , mica, and other minerals in lesser quantities Large masses of granite are a major ingredient of mountain ranges Granite is a plutonic rock, meaning that it forms deep underground Slow cooling gives atoms time to migrate to the surfaces of growing crystals
  • hypersolvus granite | Encyclopedia. com
    hypersolvus granite A granite which has crystallized above the solvus temperature and hence contains only one alkali feldspar type The solvus temperature is that temperature below which two alkali feldspars of contrasting composition are in equilibrium Source for information on hypersolvus granite: A Dictionary of Earth Sciences dictionary
  • phonolite - Encyclopedia. com
    phonolite A fine-grained, porphyritic, extrusive, igneous rock consisting of essential alkali feldspar (sanidine or anorthoclase), nepheline, sodic pyroxene, and sodic amphibole (with or without iron-rich olivine), with accessory sphene, apatite, and zircon Where present, phenocrysts can consist of alkali feldspar, sodic pyroxene, or sodic amphibole Phonolites are the extrusive equivalent of
  • Bowens Reaction Series - Encyclopedia. com
    The continuous arm of Bowen's reaction series represents the formation of feldspar (plagioclase ) in a continuous and gradual series that starts with calcium rich feldspar (Cafeldspar, CaAlSiO) and continues with a gradual increase in the formation of sodium containing feldspar (Ca-Na-feldspar, CaNaAlSiO) until an equilibrium is established at





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