leucite

leucite
—leucitic /looh sit"ik/, adj.
/looh"suyt/, n.
a whitish or grayish mineral, potassium aluminum silicate, KAlSi2O6, found in alkali volcanic rocks.
[1790-1800; < G Leukit. See LEUCO-, -ITE1]

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One of the most common feldspathoid minerals, potassium aluminosilicate (KAlSi2O6).

It occurs only in igneous rocks, particularly potassium-rich, silica-poor, recent lavas. Some important localities include Rome, Italy; Uganda; and Wyoming's Leucite Hills. Leucite is used as a fertilizer in Italy (because of its high potassium content) and as a source of commercial alum.

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      one of the most important feldspathoid minerals, a potassium aluminosilicate (KAlSi2O6). It occurs only in igneous rocks, particularly potassium-rich, silica-poor, recent lavas. Some important localities include Rome; Uganda; and Leucite Hills, Wyo., U.S. Leucite is used as a fertilizer in Italy (because of its high potassium content) and as a source of commercial alum. For detailed physical properties, see feldspathoid (table).

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  • Leucite — is a rock forming mineral composed of potassium and aluminium tectosilicate K [AlSi2O6] . Crystals have the form of cubic icositetrahedra but, as first observed by Sir David Brewster in 1821, they are not optically isotropic, and are therefore… …   Wikipedia

  • Leucite — Catégorie IX : silicates[1] Cristaux de leucite Général …   Wikipédia en Français

  • leucite — [ løsit ] n. f. et m. • 1796; de leuc(o) et ite 1 ♦ N. f. Minér. Silicate de potassium et d aluminium, blanc à l éclat vitreux, que l on trouve dans les roches volcaniques. 2 ♦ N. m. (1890) Bot. ⇒ plaste. ● leucite nom masculin Synonyme ancien de …   Encyclopédie Universelle

  • Leucite — Leu cite (l[=u] s[imac]t), n. [Gr. leyko s white: cf. F. leucite.] [1913 Webster] 1. (Min.) A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash {KAlSi2O6}. It is found in the …   The Collaborative International Dictionary of English

  • leucite — s. f. [Mineralogia] Espécie de feldspato de lustre vítreo.   ♦ Grafia no Brasil: leucita …   Dicionário da Língua Portuguesa

  • leucite — [lo͞o′sīt΄] n. [Ger leucit, now leuzit (< Gr leukos, white: see LIGHT1) + it, ITE1] a white or gray mineral, KAlSi2O6, found in potassium rich igneous rocks; potassium aluminum silicate …   English World dictionary

  • leucite — noun A mineral of silica poor igneous, plutonic and volcanic rocks. Chemically, Leucite is a potassium feldspar with insufficient silica to satisfy the chemical bonds. Because of the unfilled bonds, Leucite weathers rapidly and can only be seen… …   Wiktionary

  • leucite — 1leu·cì·te s.f. TS mineral. minerale di colore bianco del gruppo dei feldspatoidi, costituito da alluminosilicato di potassio, componente abbondante di alcune rocce effusive e ottimo substrato di suoli fertili {{line}} {{/line}} DATA: 1817. ETIMO …   Dizionario italiano

  • leucite — leucitas statusas T sritis chemija apibrėžtis Mineralas. formulė K[AlSi₂O₆] atitikmenys: angl. leucite rus. лейцит …   Chemijos terminų aiškinamasis žodynas

  • leucite syenite — Syenite Sy e*nite, n. [L. Syenites (sc. lapis), from Syene, Gr. ?.] (Min.) (a) Orig., a rock composed of quartz, hornblende, and feldspar, anciently quarried at Syene, in Upper Egypt, and now called {granite}. (b) A granular, crystalline, ingeous …   The Collaborative International Dictionary of English

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