Tourmaline - definition, pronunciation, transcription

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Amer.  |ˈtʊrməˌlɪn|  American pronunciation of the word tourmaline
Brit.  |ˈtʊəməlɪn|  British pronunciation of the word tourmaline

noun

- 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
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