Guilleminite - Sold
- Musonoi mine
- Katanga Province
- Democratic Republic of the Congo
- 3.5 by 2.8 by 1.8 cm – Miniature specimen (fits into a 5 cm cube)
Guilleminite is a hydrated uranyl barium selenate. The mineral name honors French mineralogist Claude Guillemin (1923–1994) (Pierrot et al. 1965). Guilleminite forms a yellow crust with spots of malachite on a fracture surface in selenium bearing digenite.
This specimen was part of the personal collection of Ralph Merrill, proprietor of the prolific mail order business Minerals Unlimited. He obtained the piece in 1970 from the French National Museum. Merrill's collection card and label also ship with the specimen.