Rich group of prismatic pyromorphite crystals, of an intense green color and forming radial aggregates. This specimen comes from this not well-known mine, one of the most remote in central Wales. The first works date from 1854, and continued to be exploited intermittently until 1896. Total registered production is 3271 tons of lead ore. Sphalerite and marcasite are relatively common species, while pyromorphite is rare. The specimen comes from the former Joan Astor collection and was purchased from Montal in 1977. With old labels.