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The black opal, which is an intense gray or blue or near-black, is seldom found ...
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The black opal, which is an intense gray or blue or near-black, is seldom found and, for this reason, particularly valuable. The lighter white opal or the yellow, orange or red fire opal are far more frequently mined. Transparent opals reflect changing colors as the stone is turned. This is caused by the play of light on tiny cracks and other imperfections inside the stone.The word transparent highlighted above could best be replaced by which of the suggested words?
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