dichroite

/ˈdaɪkroʊˌaɪt/
noun
  1. A mineral that is a type of cordierite, often blue or violet, and shows strong dichroism.
    • The collector added a piece of dichroite to her mineral display.
    • Dichroite is sometimes called 'water sapphire' because of its blue color.
    • Miners found a large deposit of dichroite in the mountains.
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