Pyrognomic

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 been previously observed by William Hyde Wollaston and Jöns Jacob Berzelius.

References

• Weisstein Encyclopedia
• Theodor Scheerer, Erörterung der plutonischen Natur des Granits und der damit verbundenen krystallinischen Silikate (nach einer Übersetzung von Frapolli) / Discussion sur la nature plutonique du granite et des silicates qui s′y rallient (traduit de l′allemand par L. Frapolli), Bulletin de la Société géologique de France, 2e série, IV, p. 468-498, 1847