Perroudite

Perroudite was first observed at Tsumeb by Hartwig Hetterich (of Saarbrücken, Germany) who provided material for verification and study. Keller et al. (2005) were able to confirm perroudite by EDS and single crystal XRD and used the Tsumeb material for a structure determination. The perroudite occurs as minute, bright red crystals on arsentsumebite associated with azurite. The studied specimen was from an unknown location in the mine; Keller et al. (2005) remarked that "Specimens of this kind (lacking perroudite) are typical for both the first and the deep oxidation zone."

The association with azurite precludes a third oxidation zone origin.