Mineralpedia Details for Demesmaekerite
Named to honor Gaston Demesmaeker, a Belgian mining geologist and Director of the Geological Department at the Union Miniere du Haut Katanga. Demedmaekerite is a rare mineral that occurs in loxidized selenium-bearing copper-cobalt deposits. It can be found at its type locality in the Musonoi mine near Kolwezi in the Katanga Copper Crescent in the Democratic Republic of the Congo, and at Zalesi in Moravia in the Czech Republic. Demesmaekerite is fairly radioactive.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/demesmaekerite.pdf
Demesmaekerite from Musonoi mine, Kolwezi, Shaba Cu belt, DR of Congo
The Demesmaekerite, at the orange arrows, is an olive green elongated crystals to 3mm.