- Oxides & Hydroxides
- Supergene: in situ natural oxidation & weathering deposits
- Benallt Mine, Llŷn, Gwynedd: identified on a specimen in the Natural History Museum Collection. Romanèchite is likely to form part of the manganese ore, given the abundance of barium phases at Benallt.
- Tŷ Coch, near Porthcawl, South Wales: romanèchite occurs associated with goethite, particularly as vuggy, interlayered masses with cavities lined with fibrous calcite. Romanèchite also forms botryoforms and compound crystallites with goethite (Criddle & Symes, 1977).
There are no key localities for this specimen.
- Bevins, R.E., 1994. A Mineralogy of Wales National Museum of Wales, Geological Series No. 16, Cardiff, 146pp.
- Criddle, A.J., & Symes, R.F., 1977. Mineralization at Tŷ Coch, Glamorgan (Mid Glamorgan), Wales: the second occurrence of pyrobelonite. Mineralogical Magazine, 41, 85-90.
There are no references for this specimen.