"iridescent" in the adjective sense
1. changeable, chatoyant, iridescent, shot
varying in color when seen in different lights or from different angles
"chatoyant (or shot) silk"
"a dragonfly hovered, vibrating and iridescent"
2. iridescent, nacreous, opalescent, opaline, pearlescent
having a play of lustrous rainbow colors
"an iridescent oil slick"
"nacreous (or pearlescent) clouds looking like mother-of-pearl"
"a milky opalescent (or opaline) luster"
Source: WordNet® (An amazing lexical database of English)
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