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 the German chemist and mineralogist Theodor Scheerer (1813-1873) in 1840, but the phenomenon had bee...
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easily made incandescent
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pyrognomic 1. Pertaining to, of characteristics produced by, heat, especially as shown by blowpipe analysis. 2. Easily made incandescent.
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http://www.wordinfo.info/words/index/info/view_unit/1813/2
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