leucite
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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 — 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] * * * One of the most common feldspathoid minerals,… … Universalium
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
