Cumengeite from Penpol smelter slag locality, Cornwall

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

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

I've not managed to get a single good photo out of all of these; unfortunately the crystals are just too small for my kit to focus on well.

• #1 - 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.
• #2 - a micro micro! While this piece does have some nice crystals, extreme magnification is required - the entire specimen only around 6MM long and the crystals are certainly sub MM.
• #3 - a slightly bigger micro, with some good crystals.
• #4 - a nice micro, some white crystals which may be laurionite.