iridescence

“For example, when you look at oyster shells, they have an iridescence of pearly green and blue, and that’s definitely from minerals like copper,” she says.

Tentacular growths begin to invade the offshore structure, shimmering with oily iridescence against the rig’s dull, cold steel.

Out of the 16,724 known species and subspecies of ants worldwide, only a few exhibit blue coloration or iridescence.

And I think it's because it's got the iridescence to it as well.

Her eyes are turquoise and sparkly; her feathers a silky black with a sheen of iridescence, sometimes green, sometimes lavender depending on the light.