Edwardsite

The occurrence of edwardsite at Tsumeb was reported by Joy Désor in April 2020, based on analysis by microdiffraction, single crystal XRD, EDS and Raman spectroscopy (Joy Désor - New minerals for the Tsumeb mine, Namibia (mindat.org); accessed October 2022).

Edwardsite is one of several cadmium-bearing minerals identified by Désor in a large specimen of germanite ore (with chalcocite, galena and sphalerite) containing vugs hosting cerussite, galloplumbogummite and pyromorphite. The paragenesis also includes niedermayrite, lauraniite, lazaridisite and otavite.

Edwardsite occurs as greenish-blue or pale blue arrow-shaped crystals to 50 μm and as coatings comprising intergrowths of poorly defined crystals. Ktenasite, lauraniite and niedermayrite are common close associates.

cerussite; chalcocite; galena; galloplumbogummite; germanite; gunningite; ktenasite; lauraniite; lazaridisite; niedermayrite; otavite; pyromorphite; quartz; sphalerite; voudourisite (?)