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isopyre

[ahy-suh-pahyuh r]
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noun Mineralogy.
  1. an impure variety of opal, containing alumina, lime, and iron sesquioxide.
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Origin of isopyre

1820–30; iso- + Greek pŷr fire
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018