1) Glowing 1) Light 
• (a.) Shining with a light due to any of the various causes which produce luminescence.
General term describing any mineral capable of giving off light when put under certain conditions. Three examples of minerals that are luminescent are minerals that exhibit fluorescence, triboluminescence, and thermoluminescence.
Lu`mi·nes'cent adjective [ Latin luminare to illuminate + -escent .] (Physics) Shining with a light due to any of the various causes which produce luminescence. 
[adj] - emitting light not caused by heat
luminescent 1. The emission of light produced by means other than heat (incandescence); such as, phosphorescence, fluorescence, or bioluminescence. 2. The light emitted by luminescence.
adjective emitting light not caused by heat
emitting light not caused by heat