- Supergene: post-mining oxidation & weathering deposits
- Supergene: in situ natural oxidation & weathering deposits
- Central Wales Orefield: common as microcrystals at many of the mines within this orefield. Notable localities include: Bwlch-glas Mine where, microcrystals of anglesite have been found underground in situ, occurring in cavities in part-oxidized galena (Braithwaite 1982a); Dylife Mine as colourless crystals, up to 1.5 mm in size, associated with linarite, brochantite, lautenthalite and susannite (Rust & Rust 1987); Eaglebrook Mine where anglesite occurs as blocky crystals, exceptionally 7 mm in size, and also as white pseudomorphs after linarite (Braithwaite, 1982b); Esgairhir Mine as thin crusts and euhedral crystals (<1 mm) and pseudomorphs after linarite (Rust & Mason, 1988); Frongoch Mine occasionally as excellent microcrystals from the tips at this site, within which a diverse post-mining supergene mineral assemblage has developed. It forms blocky crystals to 1.5 mm and blades to 3 mm. Associated minerals are covellite, linarite and native sulphur (Green et al., 1996); Llechweddhelyg Mine occasionally as minute gemmy yellow to clear crystals in cavities in part-oxidized galena, or as colourless equant crystals on linarite (Jones, 1987); Nant Melyn Mine some fine microcrystals of anglesite, occurring as gemmy blocky crystals associated with linarite (J.S. Mason, unpublished data).
- Dolyhir Quarry, Old Radnor, Powys: fine euhedral crystals of anglesite were collected here in the mid-1990s. Of equant habit, occasionally reaching 5 mm in size, they occurred in cavities within massive intergrown galena and tennantite. Associated minerals were bindheimite, sulphur and cerussite.
- Llangynog Mine, Llangynog, Powys: colorless to white crystals, exceptionally 4 mm across, have occasionally been found in cavities in galena (associated with native sulphur) or in gossan with linarite (Bevins & Mason, 1997).
- Machen Quarry, Caerphilly, South Wales: some superb and large crystals of anglesite were found at this locality in the 1980s, in cavities in a galena vein exposed by quarrying. Examples from these finds are preserved in the National Museum of Wales Collection (e.g. specimen NMW 85.62G.M.1). Other specimens are known in which anglesite crystals reach over 20 mm in size (I.E. Jones Collection).
- Parys Mountain, Anglesey: the type locality for anglesite. It occurred (for very little has been found in recent years) as euhedral crystals, white to yellow in colour and translucent to transparent, typically scattered as individuals on brown to greyish gossan matrix. Individual crystals can reach 10 mm in size but 4-5 mm is more typical. The acidic groundwater conditions on Parys Mountain, caused by the abundance of oxidizing pyrite, helped to create conditions in which abundant anglesite was, unusually, deposited in an open but stable environment.
- Wedding Cave Mine, Bwlchgwyn, Wrexham: anglesite occurs in a complex supergene assemblage associated with cerussite, linarite and carbonate-cyanotrichite (Green, 1995).
There are no key localities for this specimen.
- Beudant, F.S., 1832. Traité élémentaire de Minéralogie. 2nd Edition. Paris.
- Bevins, R.E. & Mason, J.S., 1997. Welsh metallophyte and metallogenic evaluation project: Results of a minesite survey of Dyfed and Powys. CCW Contract Science Report No. 156. National Museums & Galleries of Wales.
- Braithwaite, R.S.W., 1982b. Pyromorphite, wulfenite and other minerals from the Bwlch-Glas mine, Central Wales. Mineralogical Record, 13, 151-153.
- Braithwaite, R.S.W., 1982a. Wroewolfeite in Britain. Mineralogical Record, 13, 167-174.
- Green, D.I., 1995. Carbonate-cyanotrichite from the Wedding Cave mine, Bwlchgwyn, Clwyd. UK Journal of Mines & Minerals, 15, 19.
- Green, D.I., Rust, S.A. & Mason, J.S., 1996. Classic British mineral localities: Frongoch Mine, Dyfed. UK Journal of Mines & Minerals, 17, 29-38.
- Jones, A.D., 1987. The minerals of Llechweddhelyg. U.K. Journal of Mines and Minerals, No. 3, 25-27.
- Mason, J.S. & Green, D.I., 1995. Supergene minerals including exceptional ramsbeckite from Penrhiw Mine, Ystumtuen, Dyfed. UK Journal of Mines & Minerals, 15, 21-27.
- Mason, J.S. & Rust, S.A., 1997. The Mineralogy of Ystrad Einion Mine, Dyfed, Wales. U.K. Journal of Mines and Minerals, 18, 33-36.
- Monnet, M., 1779. Nouveau Systême de Minéralogie. Paris.
- Russell, A., 1944. Notes on some minerals either new or rare in Britain. Mineralogical Magazine, 27, 1-10.
- Rust, S. & Rust, D., 1987. Micro-minerals from Dyfngwm Mine. U.K. Journal of Mines and Minerals, No. 2, 28-32.
- Rust, S.A., 1990a. Mattheddleite from the Darren Mine, Dyfed, Wales. UK Journal of Mines and Minerals. 8, 47-48.
- Rust, S.A. & Mason, J.S., 1988. The minerals of Esgair-Hir mine, Dyfed, Wales. UK Journal of Mines & Minerals, 5, 35-43.
There are no references for this specimen.