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black opal

noun, Mineralogy
1.
a dark variety of opal having the characteristic opaline play of color.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for black-opal

black opal

noun
1.
any opal of a dark coloration, not necessarily black
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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