albite


albite
albitic /al bit"ik/, adj.
/al"buyt/, n. Mineral.
the sodium end member of the plagioclase feldspar group, light-colored and found in alkalic igneous rocks.
[1835-45; < L alb(us) white + -ITE1]

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Common feldspar mineral, a sodium aluminosilicate (NaAlSi3O8) that occurs most widely in pegmatites and acid igneous rocks such as granites.

It may also be found in low-grade metamorphic rocks (those formed under relatively low temperature and pressure conditions) and in certain sedimentary rocks. Albite usually forms brittle, glassy crystals that may be colourless, white, yellow, pink, green, or black. It is used in the manufacture of glass and ceramics, but its primary geologic importance is as a rock-forming mineral.

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      common feldspar mineral, a sodium aluminosilicate (NaAlSi3O8) that occurs most widely in pegmatites and felsic igneous rocks such as granites. It may also be found in low-grade metamorphic rocks and as authigenic albite in certain sedimentary varieties. Albite usually forms brittle, glassy crystals that may be colourless, white, yellow, pink, green, or black. It is used in the manufacture of glass and ceramics, but its primary geologic importance is as a rock-forming mineral.

      Albite constitutes the sodium end-member of the plagioclase feldspar solid solution series and alkali feldspar series (see plagioclase; alkali feldspar). It has a triclinic framework structure with silicon and aluminum in tetrahedral (fourfold) coordination, which forms relatively large void spaces (i.e., crystallographic sites) occupied chiefly by sodium cations. At low temperatures the silicon and aluminum atoms are distributed in a highly ordered fashion, but at high temperatures (about 1,100° C [2,000° F]), the atoms have a much more random distribution. For detailed treatment of the physical properties of albite, see feldspar (table).

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Universalium. 2010.

Look at other dictionaries:

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  • albite — [ albit ] n. f. • 1814; du lat. albus « blanc » ♦ Feldspath de teinte pâle, aux macles fines non croisées. ● albite nom féminin (latin albus, blanc) Feldspath alcalin triclinique (formule NaAlSi3O8). [L albite constitue le pôle alcalin de la… …   Encyclopédie Universelle

  • Albite — is a plagioclase feldspar mineral. It is the sodium endmember of the plagioclase solid solution series. As such it represents a plagioclase with less than 10% anorthite content. The pure albite endmember has the formula NaAlSi3O8. It is a… …   Wikipedia

  • Albite — Al bite, n. [L. albus white.] (Min.) A mineral of the feldspar family, triclinic in crystallization, and in composition a silicate of alumina and soda. It is a common constituent of granite and of various igneous rocks. See {Feldspar}. [1913… …   The Collaborative International Dictionary of English

  • albite — s. f. [Mineralogia] Espécie de feldspato.   ♦ Grafia no Brasil: albita …   Dicionário da Língua Portuguesa

  • albite — [al′bīt΄] n. [< L albus, white + ITE1] a usually milky white variety of plagioclase, NaAlSi3O8, found in various plutonic rocks, esp. granite and syenite, often with twin crystals …   English World dictionary

  • albite — noun A plagioclase feldspar, the first member of the Albite Anorthite solid solution series …   Wiktionary

  • albite — albitas statusas T sritis chemija apibrėžtis Mineralas. formulė Na[AlSi₃O₈] atitikmenys: angl. albite; sodium feldspar rus. альбит; натриевый полевой шпат ryšiai: sinonimas – natrio feldšpatas …   Chemijos terminų aiškinamasis žodynas

  • albite — noun Etymology: Swedish albit, from Latin albus Date: circa 1843 a triclinic usually white mineral of the feldspar group consisting of a sodium aluminum silicate • albitic adjective …   New Collegiate Dictionary

  • albite — al·bì·te s.f. TS mineral. minerale di colore bianco o grigio, costituito da plagioclasio di sodio, abbondante in graniti e porfidi e altre rocce eruttive {{line}} {{/line}} DATA: 1855. ETIMO: der. del lat. albus bianco con 2 ite …   Dizionario italiano


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