a magnificent display of nacreous clouds
an iridescent oil slick; nacreous (or pearlescent) clouds looking like mother-of-pearl; a milky opalescent (or opaline) luster.
a magnificent display of nacreous clouds
an iridescent oil slick; nacreous (or pearlescent) clouds looking like mother-of-pearl; a milky opalescent (or opaline) luster.