slate blue

He was shown with a crown of peacock's feathers, clad in a golden dhoti and in every case his skin was mauve or slate-blue.

The night fell very cold, with an empty heaven overhead, but its lower arcs set with slate-blue cloud.

A petrel it is, about the size of a house pigeon, and of a slate-blue colour.

There was a smile on her lips, but there was fiery challenge in her slate-blue eyes.