indicolite

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indicolite

(ˈɪndɪkəˌlaɪt) or

indigolite

n
(Minerals) a form of tourmaline ranging in colour from pale blue to blue-black
[C19: from Spanish indico indigo + -lite]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive ?
A small pocket, exposed on the backside of one of these boulders, yielded a few nice loose indicolites, most of them terminated, the largest measuring 0.4 inch thick by 1.5 inches long.
From the big pocket we drove 120 feet northwest, following some very good signs, but netted only a meager little pocket of small blue indicolite tourmalines.
It was a little fist-sized opening that contained only one tourmaline, a poorly formed crystal of about an inch by 1.5 inches of medium-blue indicolite. Viewing it in the sunlight I caught a gleam of reflective light that signaled cat's-eye.
In Kazakhstan the Kalban district has produced some fine bicolored green-red tourmalines as well as rare, flawless indicolites to 5 cm.