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Pyrognomic materials are easily made incandescent. Minerals and metals commonly glow when heated, but those that are pyrognomic glow at much lower temperatures. Allanite and gadolinite are examples of pyrognomic minerals. The term was introduced by Scheerer in 1840, but the phenomenon had been previously observed by Wollaston and Berzelius.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Pyrognomic". A list of authors is available in Wikipedia.|