Tourmaline

Tourmaline
Tourmaline Tour"ma*line, n. [F. tourmaline, cf. It. turmalina, tormalina, NL. turmalina, turmalinus; all fr. tournamal, a name given to this stone in Ceylon.] (Min.) A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transparent are valued as jewels. [Written also {turmaline} .] [1913 Webster]

Note: Crystals of tourmaline when heated exhibit electric polarity (see {Pyroelectric}, n.). Tourmaline is also used in the form of a polariscope called tourmaline tongs. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Tourmaline — Schorl Tourmaline General Category Cyclosilicate Chemical formula (Ca,K,Na,[ …   Wikipedia

  • Tourmaline — Catégorie IX : silicates[1] Tourmaline Brésil Général …   Wikipédia en Français

  • TOURMALINE — Cyclosilicate cristallisant dans le système rhomboédrique. Du mot cinghalais touramali , la tourmaline se présente sous forme de cristaux prismatiques allongés parallèlement à l’axe ternaire. Les plus courants sont de petite taille, mais ils… …   Encyclopédie Universelle

  • tourmaline — complete silicate of aluminum and boron, 1759, ultimately from Sinhalese toramalli, a general name for cornelian …   Etymology dictionary

  • tourmaline — [toor′mə lin, toor′məlēn΄] n. [Fr, ult. < Sinhalese tōramalli, carnelian] a very hard, piezoelectric, rhombohedral mineral, (Na,Ca)(Mg,Fe,Al,Li) 3Al6 (BO3) 3 (Si6O18)(OH) 4, of various colors, used as a gem and in making pressure gauges …   English World dictionary

  • tourmaline — tourmalinic /toor meuh lin ik/, adj. /toor meuh lin, leen /, n. any of a group of silicate minerals of complex composition, containing boron, aluminum, etc., usually black but having various colored, transparent varieties used as gems. Also,… …   Universalium

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  • tourmaline — (tour ma li n ) s. f. Minéral siliceux, de composition très complexe, qui jouit de la propriété de prendre la bipolarité lorsque les extrémités de ses cristaux sont inégalement chauffées. •   Toutes les tourmalines sont à demi transparentes ; les …   Dictionnaire de la Langue Française d'Émile Littré

  • tourmaline — turmalinas statusas T sritis chemija apibrėžtis Mineralas. formulė NaFe₃Al₆[(OH)₄|(BO₃)₃|Si₆O₁₈] atitikmenys: angl. tourmaline rus. турмалин …   Chemijos terminų aiškinamasis žodynas

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