Uranium(IV,VI) minerals

Agrinierite is a mineral often found in the oxidation zone of uranium deposits. It is named after Henry Agrinier (1928–1971), a French engineer for the Commissariat à l'Énergie Atomique (Mineralogy Laboratory of the French Atomic Energy Commission, Paris, France). Agrinierite is a hydrated oxide of uranium discovered during the exploitation of the uranium deposit of Margnac (Haute-Vienne, France), the only site in the world where it is known today. It appears at the periphery of uraninite nodules accompanied by other uranium oxides which result like it from the transformation of uraninite (bec

Cleusonite is a member of the crichtonite group of minerals with the chemical formula . This group of minerals contains approximately thirteen complex metal titanates. The structures of minerals of this group is complicated by frequent fine-scale twinning and metamictization due to radioactive elements. The crichtonite group consists of members of related mineral species of the type A{BC2D6E12}O38 which are characterized by their predominant cations (as seen in crichtonite (Sr), senaite (Pb), davidite (REE + U), landauite (Na), loveringite (Ca), lindsleyite (Ba), and mathiasite (K).