AskDefine | Define tourmaline

Dictionary Definition

tourmaline n : 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

User Contributed Dictionary

English

Noun

  1. A complex black or dark coloured borosilicate mineral, used as gemstone.

Translations

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