- Supergene: post-mining oxidation & weathering deposits
- Supergene: in situ natural oxidation & weathering deposits
- Bodcoll Mine, Devil’s Bridge, Ceredigion: leadhillite associated with caledonite is listed by Bevins & Mason (1997). Further investigations are required to verify this identification, which, is likely to have been made based on the visual appearance of pseudohexagonal leadhillite-like microcrystals. The presence of susannite cannot be ruled out.
- Brynyrarian Mine, Tre-Taliesin, Ceredigion: leadhillite is listed by Bevins & Mason (1997), but as with Bodcoll further analysis is required to determine the true identity of this leadhillite-group mineral.
- Bwlch-glas Mine, Tal-y-bont, Ceredigion: Rust (1996) produced the first account of in-situ susannite from Wales at Bwlch-glas mine. Susannite was discovered in brecciated galena-sphalerite-quartz veinstone with minor chalcopyrite, exposed near to the famous pyromorphite-zone in the shallow adit level. Crystals are tabular to blocky, colourless to white and reach 0.8 mm, occasionally associated with blue-green prismatic caledonite crystals to 0.4 mm, anglesite, cerussite and malachite.
- Darren Mine, Pen-bont Rhydybeddau, Ceredigion: leadhillite is listed by Bevins & Mason (1997). No description is given, but due to visual similarities between leadhillite and susannite the possibility remains that this could represent susannite.
- Esgairhir Mine, Tal-y-bont, Ceredigion: groups of rod-like susannite crystals (up to 0.3 mm) and a slightly concave prismatic form are described by Rust & Mason (1988) within highly oxidized veinstone on the dumps of the mine. Susannite forms a rare part of the supergene assemblage in association with caledonite, leadhillite and anglesite.
- Frongoch Mine, Devil's Bridge, Ceredigion: susannite is relatively common at Frongoch, forming microcrystals representing a late-stage post-mining phase. Crystals reach 2 mm and occur in a variety of habits. Green et al. (1996) describe typical tabular to blocky pseudohexagonal forms along with a more unusual elongated prismatic habit. One particular feature of Frongoch susannite is that, some crystals display step-like growth formations, interrupted growth, and overgrowths of several different crystal forms producing some wonderful forms. Colour varies from colourless to white and cream with green, blue or yellow tints or occasionally toffee brown. As with many localities caledonite is a common associate on a characteristic matrix of corroded galena.
- Gorlan Mine, Trefriw, Gwynedd: leadhillite is listed by Bevins & Mason (1998), but no further details are given. Until this record is verified as leadhillite, there remains the possibility that it could be susannite. This would represent the first occurrence outside of the Central Wales Orefield.
- Hendrefelin Mine, Ysbyty Ystwyth, Ceredigion: confirmed by Clark & Rust (1993) from the same dump as bottinoite.
- Llechweddhelyg Mine, Penrhyncoch, Ceredigion: susannite has several modes of occurrence: as yellowish transparent pseudohexagonal platy crystals (up to 1 mm); colourless pseudohexagonal crystals (up to 0.6 mm) covering areas of 1 cm|2; and as minute prismatic crystals (Rust, 1990) associated with caledonite.
- Llettyhen Mine, Bontgoch, Ceredigion: susannite is listed without description by Bevins & Mason (1997).
- Nant-y-creiau Mine, Devil’s Bridge, Ceredigion: small blocky pseudohexagonal leadhillite-group crystals occur within heavily weathered pyritic lead-zinc-copper bearing veinstone dumped within the bed of a dried up stream.
- Nantmelin Mine, Central Wales: a leadhillite-group mineral richly encrusting highly altered galena-bearing veinstone from the shaft dumps shows visual similarities to susannite from Frongoch Mine. Pale cream, platy pseudohexagonal microcrystals with a pronounced stepped growth pattern, form layers associated with linarite (T.F. Cotterell, unpublished data).
- Bevins, R.E., 1994. A Mineralogy of Wales National Museum of Wales, Geological Series No. 16, Cardiff, 146pp.
- Bevins, R.E. & Mason, J.S., 1998. Welsh Metallophyte and metallogenic evaluation project: Results of a Minesite Survey of Gwynedd. National Museums of Wales, Cardiff.
- 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.
- Clark, A.M. & Rust, S.A., 1993. Bottinoite, a mineral new to Britain. Mineralogical Magazine. 57, 543-544.
- 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.
- Rust, S., 1996. Susannite and caledonite in-situ in Central Wales. U.K. Journal of Mines and Minerals, 17, 18.
- Rust, S.A., 1990b. Susannite and sulphatian schmeiderite from Llechwedd Helyg Mine, Tir-y-Mynach, Dyfed, Wales. U.K. Journal of Mines and Minerals, 8, 48
- Rust, S.A. & Mason, J.S., 1988. The minerals of Esgair-Hir mine, Dyfed, Wales. UK Journal of Mines & Minerals, 5, 35-43.