When fluorite is exposed to ultraviolet light, does it melt?
Not to my knowledge....
It certainly glows under UV light. See this site.
Of course fluorite is the mineral form of
No. Melting is a temperature related effect.
Melting is a change of state from solid to liquid as a result of increased temperature. Fluorite has a melting point above 1500 degrees C, so simply illuminating it with UV light will not cause "melting" at all.