labradorite

labradorite
A plagioclase feldspar, the fourth member of the Albite-Anorthite solid solution series. Often very coarsely crystalline, it is used as a decorative stone for carvings and building façades. Crystal surfaces often show a bluish reflection called "Schiller", which resembles the reflections from a butterflys wing. ,Chemical composition: Calcium sodium aluminum silicate, ,Physical properties: Mohs Hardness: 6.0 Specific gravity: 2.71 Color: Usually bluish-gray to dark gray Luster: glassy Fracture: conchoidal Cleavage: two good at about 94º to each other Habit: Triclinic - pinacoidal. Crystals are common and usually striated.

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  • Labradorite — Catégorie IX : silicates[1] Labradorite section poli …   Wikipédia en Français

  • Labradorite — ((Ca,Na)(Al,Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. It is usually defined as having %An (anorthite) between 50 and 70. The specific gravity ranges from 2.71 to 2.74. The streak is white, like… …   Wikipedia

  • labradorite — ● labradorite nom féminin Basalte leucocrate à labrador. Synonyme de labrador. ● labradorite (synonymes) nom féminin Synonymes : labrador labradorite [labʀadɔʀit] n. f. ÉTYM. 1842; de Labrador, région où l on trouve c …   Encyclopédie Universelle

  • Labradorite — Lab ra*dor ite, n. (Min.) A kind of feldspar commonly showing a beautiful play of colors, and hence much used for ornamental purposes. The finest specimens come from Labrador. See {Feldspar}. [1913 Webster] …   The Collaborative International Dictionary of English

  • labradorite — s. f. [Mineralogia] Ver lavradorite.   ♦ Grafia no Brasil: labradorita …   Dicionário da Língua Portuguesa

  • labradorite — [lab′rə dôr īt΄, lab΄rə dôr′īt΄] n. [after LABRADOR2, where specimens have been found] a variety of plagioclase with dark, iridescent colors …   English World dictionary

  • labradorite — labradoritic /lab reuh daw rit ik/, adj. /lab reuh daw ruyt , lab reuh dawr uyt/, n. a feldspar mineral of the plagioclase group, often characterized by a brilliant change of colors, with blue and green most common. [1805 15; named after LABRADOR …   Universalium

  • labradorite — labradoras statusas T sritis geologija ir mineralogija apibrėžtis Albito ir anortito izomorfinis mišinys, plagioklazas. atitikmenys: angl. labradorite rus. лабрадор …   Chemijos terminų aiškinamasis žodynas

  • labradorite — noun Etymology: Labrador Peninsula, Canada Date: 1814 an iridescent feldspar used especially in jewelry …   New Collegiate Dictionary

  • labradorite — (la bra do ri t ) s. m. Terme de minéralogie. Feldspath à reflets opalins qu on trouve sur la côte du Labrador, et dont on fait des tables, des vases, etc.    On dit aussi labrador …   Dictionnaire de la Langue Française d'Émile Littré

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