Alstonite pseudohexagonal bipyramids to 5 mm on witherite tabular pseudohexagonal twins with baryte, 7 cm, New Brancepeth
According to Symes & Young (2008), "A few specimens were collected in 1909 from the barite-witherite vein at New Brancepeth Colliery, near Durham," and presumably this specimen dates from that time.