A mineral or crystalline substance with reflective properties, or historically, a type of polished stone used as a mirror.
From Greek 'katoptron' (mirror) + -ite (mineral suffix). The -ite ending is used in mineralogy to denote specific minerals and crystal types.
Before glass mirrors existed, people polished metals and certain stones to use as mirrors—'catoptrite' describes these reflective materials that ancient peoples valued almost as highly as precious gems.
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