Chlorolestes fasciatus, the mountain malachite or mountain sylph is a species of damselfly in the family Synlestidae.

It is found in Lesotho, South Africa and Eswatini.

Males and females are similar; the thorax and abdomen are metallic-green aging to coppery brown.

The thorax has contrasting yellow antehumeral stripes; these are more narrow than those of the similar Forest Malachite.

Most mature males have opalescent and blackish wing bands.