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black opal

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noun Mineralogy.
  1. a dark variety of opal having the characteristic opaline play of color.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for black opal

black opal

noun
  1. any opal of a dark coloration, not necessarily black
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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