opal [oh-puh l]
1. a mineral, an amorphous form of silica, SiO 2 with some water of hydration, found in many varieties and colors, including a form that is milky white.
2. an iridescent variety of this that is used as a gem.
3. a gem of this.
Origin: 1350-1400; Middle English < Latin opalus < Greek opállios opal, gem; probably from a source akin to Sanskrit upala precious stone
Now YOU come up with a sentence (or fic? or graphic?) that best illustrates the word.