Mineralpedia Details for Arsentsumebite
Named as the arsenate analogue of tsumebite. Arsentsumebite is a rare mineral that can be found in Namibia, Germany, the Czech Republic, the United States, and Australia, and a few others. It occurs in oxidized hydrothermal polymetallic deposits in association with malachite, cerussite, smithsonite, mimetite, bayldonite, conichalcite, duftite, quartz, and iron oxides.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/arsentsumebite.pdf
Arsentsumebite from Tsumeb mine, Tsumeb, Namibia
Lime green micro crystal aggregates to 1mm with dark blue, lustrous Azurite.