Which of the three basic cloud types contain ice crystals?

Question

Which contains ice crystals:cumulus, cirrus, of stratus?

Answer 1

All of them.

Answer 2

Cirrus only.Sometimes cumulus grows and becomes cumulonimbus.In that case it will contains hail stones not ice crystals.Stratus is a very low cloud and is found sometimes near the ground.It will not generally contain ice except in very cold places where the surface temperature is below zero degree celcius.

Answer 3

Cirrus clouds are made of ice crystals.

Cirrostratus clouds are also made up of ice crystals.