Chrysoritis pyroeis, the sand-dune opal, is a butterfly of the family Lycaenidae. It is found in South Africa.

The wingspan is 22–31 mm for males and 25–38 mm for females. Adults are on wing from August to April with peaks from September to October and in February. There are several generations per year.

The larvae feed on Zygophyllum flexuosum and Thesium species. They are attended to by Myrmicaria nigra ants.

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