Chalcomenite and Demesmaekerite

Chalcomenite and Demesmaekerite, extension of the Musonoï mine, Katanga, Democratic Republic of Congo. On a black siegenite matrix, 3.2 x 2.2 x 1.5 cm, a cavity covered with blue chalcomenite crystals, a copper selenate, and several olive green-brown coatings of demesmaekerite, a radioactive mineral, a rare copper and lead urano-arsenate. Handwritten label coll. G. Gauthier