thermoluminescent

Minerals that emit bright light when heated. For example, chlorophane is a variety of fluorite that emits bright green light when heated.
Found on http://www.encyclo.co.uk/local/22290

thermoluminescent

thermoluminescent 1. A phenomenon in which certain minerals release previously absorbed radiation when moderate heat is applied. 2. The glow or emission of light produced by the application of heat; used to monitor the radiation dose to which a substance has been exposed. 3. The production of light by a substance when its temperature is increased.
Found on http://www.wordinfo.info/words/index/info/view_unit/1212/7
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