- Cwm Dwyfnant, Llangammarch Wells, Powys: the occurrence of allophane from a level driven on a marcasite vein at Cwm Dwyfnant was confirmed by X-ray diffraction and chemical analysis by G.T. Prior (Natural History Museum specimen B.M. 1918,403).
- Gorlan Mine, Trefriw, Gwynedd: Russell (1944) reported ‘gum-like’, brownish-yellow allophane coated by dundasite and enveloping crystals of cerussite, quartz and anglesite, all these minerals occurred as a secondary assemblage on the galena, blende and marcasite lode. Allophane was identified by wet chemistry but no analyses were published.
- Welsh Foxdale (New Pandora) Mine, Trefriw, Gwynedd: Prior (1906) described the occurrence of allophane from Welsh Foxdale (=New Pandora) Mine, near Trefriw, Gwynedd, where it occurs as ‘beautiful, small glassy spherules associated with dundasite and cerussite’.
There are no key localities for this specimen.
- Jenkins, D.A. & Johnson, D.B., 1993. Abandoned metal mines: a unique mineralogical and microbiological resource. Journal of the Russell Society, 5, 40-44.
- Prior, G.T., 1906. Dundasite from North Wales. Mineralogical Magazine, 14, 167-169
- Russell, A., 1944. Notes on some minerals either new or rare in Britain. Mineralogical Magazine, 27, 1-10.
There are no references for this specimen.