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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.
[French, from Sinhalese toramalli, carnelian.]
(Minerals) any of a group of hard glassy minerals of variable colour consisting of complex borosilicates of aluminium with quantities of lithium, sodium, calcium, potassium, iron, and magnesium in hexagonal crystalline form: used in optical and electrical equipment and in jewellery
[C18: from German Turmalin, from Sinhalese toramalli carnelian]
tour•ma•line(ˈtʊər mə lɪn, -ˌlin)
a complex silicate mineral, essentially sodium aluminum borosilicate, occurring in variously colored transparent gem varieties depending on the presence of different metals.
[1750–60; earlier tourmalin < German Turmalin, ultimately < Sinhalese tōramalliya carnelian; see -in1]
tour`ma•lin′ic (-ˈlɪn ɪk) adj.
A silicate mineral consisting of aluminum, boron, and other elements. Tourmaline occurs in many different translucent colors, usually in crystals shaped like 3-, 6-, or 9-sided prisms. It is especially common in pegmatites.
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|Noun||1.||tourmaline - a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones|
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
schorl - black tourmaline
transparent gem - a gemstone having the property of transmitting light without serious diffusion