indicolite

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indicolite

[in′dik·ə‚līt]
(mineralogy)
An indigo-blue variety of tourmaline that is used as a gemstone. Also known as indigolite.
References in periodicals archive ?
When we were just a few feet beyond the indicolite mini-pocket, we began removing huge gobs of damp red clay that filled broad fractures between disjointed boulders of the core zone pegmatite.
Slowly, the layers of harder pocket components that had coated and hidden most of the crystals were worn away, revealing a unique matrix specimen--a pale pink beryl measuring 1.4 by 1.75 inches, attached to matrix supporting an array of colorful pink tourmaline crystals, all with indicolite rinds and terminations, some of them up to 0.4 inches thick.
Two 0.4-inch crystals in this pocket started their growth about an inch and a half apart, one a classic blue-cap elbaite, and the other with a pink base that transforms mid-way into a pure blue indicolite. Its blue termination butts into the upper section of the blue-cap forming a sort of tilted "A" frame, making altogether a spectacular matrix arrangement.
Little by little the adit was cleared to the area where the indicolite had been found.