Iolite

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Iolite (Min) A silicate of alumina, iron, and magnesia, having a bright blue color and vitreous luster; cordierite. It is remarkable for its dichroism, and is also called dichroite. A variety called Caribbean iolite has a lighter blue color.
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Century Dictionary and Cyclopedia
    • n iolite A silicate of magnesium, aluminium, and iron, a mineral of a violet-blue color with a shade of purple or black. It often occurs in six-sided rhombic prisms. The smoky-blue peliom and steinheilite are varieties. Iolite is very subject to chemical alteration, and many names have been given to the more or less distinct compounds so formed, as pinite, fahlunite, gigantolite, etc. Also called dichroite (because the tints along the two axes are unlike) and cordierite.
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Chambers's Twentieth Century Dictionary
    • n Iolite ī′o-līt a transparent gem which presents a violet-blue colour when looked at in a certain direction.
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Etymology

Webster's Revised Unabridged Dictionary
Gr. 'i`on a violet + -lite,
Chambers's Twentieth Century Dictionary
Gr. ion, violet, lithos, stone.

Usage

In literature:

Iolite is a hydrous magnesium and aluminium silicate, with ferrous iron partially replacing magnesium.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 6" by Various
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In news:

Iolite Beads -Colorful Choice in Colored Gemstones Beads .
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