Cumengeite from Penpol smelter slag locality, Cornwall

Cumengeite from Penpol smelter slag locality, Penpol, Feock, Cornwall, England, UK

Small specimen of Cumengeite on slag from the Penpol smelter and associated dumps.

Occurs alongside an unidentified green mineral which is probably Mammothite. Unfortunately, my microscope just isn't good enough to get a good image of these, even with stacked images.