fire opal

noun
a red Mexican opal, often with a color play.

Origin:
1810–20

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World English Dictionary
fire opal
 
n
an orange-red translucent variety of opal, valued as a gemstone

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It was evidently an enormous fire opal, changing color incessantly as if by an internal illumination.
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