˜yÐÄvlog

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isopyre

[ ahy-suh-pahyuhr ]

noun

Mineralogy.
  1. an impure variety of opal, containing alumina, lime, and iron sesquioxide.
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˜yÐÄvlog History and Origins

Origin of isopyre1

1820–30; iso- + Greek ±èÅ·°ù fire

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