[ yoo-kleys, -kleyz ]
/ ˈyu kleɪs, -kleɪz /
a rare green or blue mineral, beryllium aluminum silicate, BeAlSiO4(OH), occurring in prismatic crystals.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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Some other minerals in which it occurs are phenakite, euclase, and chrysoberyl.A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer