Green Turquoise What Causes Translucent Colours Like Sea-green, Turquoise And Pink In The Sky?

What causes translucent colours like sea-green, turquoise and pink in the sky? - green turquoise

The other evening, after sunset and before the red sky, a few fine translucent colors appeared above, where the setting sun and clouds. There is a rainbow, but the light has a similar appearance and non-twilight rays. Just round or rectangular are other colors. I think it's the ice particles, or something similar. Salud!