Answer: girosol

AnswerCrossword Clue
girosolopal that reflects light in a bright luminous glow
girosolsunflower, Helianthus tuberosus, having edible, tuberous, underground stems or rootstocks
girosola variety of opal, also GIRASOL, GIRASOLE
girosol(of a stone) translucent and bluish-white with reddish reflections under strong light; opalescent