albite


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Related to albite: microcline, augite

albite

(ăl`bīt): see feldsparfeldspar
or felspar
, an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these elements.
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albite

[′al‚bīt]
(mineralogy)
NaAlSi3O8 A colorless or milky-white variety of plagioclase of the feldspar group found in granite and various igneous and metamorphic rocks. Also known as sodaclase; sodium feldspar; white feldspar; white schorl.
References in periodicals archive ?
Then, a progressive metamorphism in these rocks is marked by the passing of greenschist facies mineralogy [actinolite + chlorite + quartz + plagioclase (albite) + epidote minerals [+ or -] muscovite [+ or -] calcite] to epidote-amphibolite facies mineralogy [hornblende + epidote minerals + quartz + albite [+ or -] garnet], and finally to amphibolite facies mineralogy [hornblende + garnet + plagioclase [+ or -] quartz].
The bias of almost all of the PLS models was negative; only the bias of the PLS model of albite for KBr pellets had a positive value.
Alvaro Lucio (alucio@matrix.com.br) had about a dozen miniature and small cabinet-size specimens of hydroxylherderite horn Virgem da Lapa, Minas Gerais, with lustrous, sharp, twinned crystals, color-zoned in pale violet and pale brown, to 4 X 8 cm, the matrix pieces showing attractive associations of sparkly white albite crystals and muscovite rosettes.
We used synthetic components (MgO for Mg) and natural minerals (orthoclase for Si and K, albite for Na, hematite for Fe, diopside for Ca and Mg, fluorite for F, rhodonite for Mn), as standards.
Although the BLP is locally deformed (Kontak 2004), the tantalite-bearing sample used for dating records no evidence of post-crystallization deformation and, instead, the tantalite grains formed a cluster of radiating euhedral crystals in a host of coarse albite (Fig.
Caption: Figure 4: X-ray diffraction of coal gangue after [Na.sub.2]C[O.sub.3] activation and [H.sub.2]S[O.sub.4] wash and typical chemical formula of the mineral components: quartz (Si[O.sub.2]), kaolinite ([Al.sub.2][Si.sub.2][O.sub.5][(OH).sub.4]), albite (NaAl[Si.sub.3][O.sub.8]), nepheline (K[Na.sub.3][(AlSi[O.sub.4]).sub.4]), lime (CaO), sodium silicate ([Na.sub.2]O-nSi[O.sub.2]), illite (K[Al.sub.2] [(Al,Si)Si3[O.sub.10]]), ankerite (CaMg[(C[O.sub.3]).sub.2]), siderite (FeC[O.sub.3]), and gismondine (Ca([Al.sub.2][Si.sub.3][O.sub.10])3[H.sub.2]O).
Na2O + K2O (8.8 wt%) and contains small amounts of diopside acmite and hypersthene in the CIPW norms that are dominated by albite quartz and orthoclase.
In this case, an increase in characteristic quartz peak intensity and the presence of other relictic phases such as albite was observed in the products so obtained.
However, the porosity of the PTP-4a granite depends on the (recalculated) amount of albite (cf.
Datolite and prehnite are still present; however, albite and calcite become more common, as do the zeolites heulandite and stilbite.
The mineralogy of the granite is composed of quartz, alkaline-plagioclase (0.97 albite), K-feldspar, muscovite and biotite.