A very small iron/manganese mine operating c1860. Although minerals here are generally minute and largely unexceptional, the small dumps here have subsequently produced the first British occurrence and only the second world occurrence of pyrobelonite. The site is now within a farmyard and has almost completely disappeared.
Pyrobelonite occurs as individual grains and clusters associated with braunite aggregates, minute hausmannite crystals, and as lamellae between barite laths. Typically very small, exceptionally the grain size reaches up to 1 cm and is often intimately associated with massive vanadinite. Also as veinlets, generally less than 0.5 mm thick, which can be traced for up to 3 cm (Criddle & Symes (1977).
Also the only location for wulfenite in south Wales, rare wulfenite occurs as white to yellow bevelled rectangular plates to 3mm, projecting from fracture surfaces in compact manganese ore with baryte and calcite lenticles (Braithwaite & Lamb, 1987).
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.
Braithwaite, R.S.W. & Lamb, R.P.H., 1986. Wulfenite from Ty Coch, Glamorgan (Powys), South Wales. Mineralogical Magazine, 50, 180-181.
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UK OS Grid Reference: SS827794
Map Reference: 51°30'3"N , 3°41'24"W
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Mineral List:10 entries listed. 10 valid minerals.
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