achroite

achroite

[′ak·rō‚īt]
(mineralogy)
A colorless variety of tourmalines found in Malagasy.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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In 2004, a 7.88-carat faceted stone was purchased in Madagascar as colorless "achroite" tourmaline.