Tourmaline definition

to͝ormə-lĭn, -lēn
A complex crystalline silicate containing aluminum, boron, and other elements, used in electronic instrumentation and, especially in its green, clear, and blue varieties, as a gemstone.
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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.
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Any of several minerals having the general chemical formula (Na,Ca)(Mg,Fe,Al,Li)3Al6(BO3)3Si6O18(OH)4 . Tourmaline occurs in many different translucent colors, usually in crystals shaped like 3-, 6-, or 9-sided prisms. It occurs in igneous and metamorphic rocks, especially in pegmatites.
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A complex black or dark coloured borosilicate mineral.
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A transparent gemstone cut from it.
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Alternative Forms

Alternative Form of tourmaline - turmaline

Other Word Forms

Noun

Singular:
tourmaline
Plural:
tourmalines

Origin of tourmaline

  • French from Sinhalese toramalli carnelian

    From American Heritage Dictionary of the English Language, 5th Edition

  • Either directly from Sinhalese tóramalli 'carnelian', or via a cognate: German Turmalin, Portuguese tormalina, or French tourmaline

    From Wiktionary