Hypertext Webster Gateway: "iolite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Iolite \I"o*lite\, n. [Gr. ? a violet + -lite.] (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.
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