Nancyrossite

The specimen from which nancyrossite was described was donated by U.S. collector W. W. Pinch and consisted of fragments of galena, sphalerite and stottite recovered from "the germanium horizon" (Welch et al. 2025) on 30 Level in the second oxidation zone. Some of the putative stottite in the sample presented with an unusual honey colour and, on analysis, was found to have a much smaller unit cell than stottite with iron predominantly in the ferric state. Nancyrossite (IMA2024-033) is the germanate analogue of jeanbandyite and is named for Nancy L. Ross, professor of mineralogy and mineral physics at Virginia Tech in the USA (Welch et al. 2024). Type material is conserved at the Natural History Museum, London (catalogue numbers BM2024,1; BM2024,2 and BM2024,3).