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Tourmaline

A complex black or dark-coloured borosilicate mineral, compounded with various chemical elements and considered a semi-precious stone.

📖 Definitions of "Tourmaline"

noun
  1. 1

    A complex black or dark-coloured borosilicate mineral, compounded with various chemical elements and considered a semi-precious stone.

  2. 2

    A transparent gemstone cut from it.

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