pyrophane
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Pyrophane — Pyr o*phane, n. [See {Pyrophanous}.] (Min.) A mineral which is opaque in its natural state, but is said to change its color and become transparent by heat. [1913 Webster] … The Collaborative International Dictionary of English
pyrophane — noun A mineral which is opaque in its natural state, but is said to change its color and become transparent by heat … Wiktionary
