- Supergene: post-mining oxidation & weathering deposits
- Supergene: minerals on an artificial substrate
- Cwmavon Valley Copper Smelting Slags, Aberavon, South Wales: the only lead mineral to have been identified in the copper smelting slags. Phosgenite occurs on the slag surface as single isolated crystals and in small groups, typically forming transparent to translucent multi-faceted barrel-shaped crystals, displaying growth zones, and long prismatic crystals with polyhedral terminations (Plant, 2003).
- Eaglebrook (Nantycagl) Mine, Ceulanymaesmawr, Ceredigion: Rust et al. (1995) record phosgenite on five micro-specimens derived from material collected from the eastern shaft dump. Phosgenite occurs as blocky, colourless crystals to 0.75 mm. The crystals show a large pinacoid, and striated prism faces parallel to the c-axis, consistent in form with phosgenite. The prism edges have a rounded appearance. On some specimens, tiny drum-like phogenite crystals are scattered on cerussite. On others, phosgenite occurs in small cavities in relatively fresh galena, commonly with anglesite and cerussite. On two of the specimens covellite is also associated.
- Pen-y-bryn shaft dumps, Halkyn, Clwyd: a specimen in the R.S.W. Braithwaite Collection (no. 64-403) collected on 15 November 1964 contains phosgenite (Bevins, 1994).
- Penrhyn Du Mine, Llŷn, Gwynedd: phosgenite was discovered by Hubbard (1991) in loose blocks of veinstone below high water mark in a gulley below Penrhyn Du Mine. Crystals take the form of pink-white striated prisms and colourless tabular plates, up to 1.5 mm in size. Phosgenite is also reported by Hubbard (1991) in-situ, within cavities in a similar galena vein, exposed approximately 100 m to the south. Crystals are smaller (to 0.25 mm), colourless and tabular in form.
- Bevins, R.E., 1994. A Mineralogy of Wales National Museum of Wales, Geological Series No. 16, Cardiff, 146pp.
- Hubbard, N., 1991. Phosgenite, the first Welsh occurrence. Journal of the Russell Society, 4 (1), 35.
- Plant, S., 2003. Secondary minerals from the Cwmavon Valley Copper Smelting Slags, Glamorgan, South Wales. Journal of the Russell Society, 8(1), 9-15.
- Rust, S., Burchmore, S. & Foy, E., 1995. Some interesting new finds from the Nant-y-cagle mine. British Micromount Society Newsletter, 40, 8-10.