iolite definition

  • noun:
    • The obvious selection of cordierite.
    • A silicate of alumina, metal, and magnesia, having a bright blue shade and vitreous luster; cordierite. It really is remarkable because of its dichroism, and it is called dichroite. A number known as Caribbean iolite features a lighter blue shade.
    • A silicate of magnesium, aluminum, and iron, a mineral of a violet-blue shade with a shade of purple or black colored.

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