Studtite 
(UO2)2O2(H2O)2 • 2H2O [CNMNC approved formula]
Named for Franz Edward Studt, Belgian prospector and geologist, author of the first geological map (1913) of Shava, Zaire.
| IMA status : | Valid species (Pre-IMA 1947) Grandfathered |
| CLASSIFICATION | |
| Dana (8th edition) : |
05.03.01.01 |
| (05) Oxides Containing Uranium and Thorium | |
| (05.03) with a cation charge of 8+ (AO4) and hydrated | |
| (05.03.01) Studtite Group | |
| Nickel-Strunz (10th edition) : |
04.GA.15 |
| (04) Oxides and Hydroxides | |
| (04.G) Uranyl Hydroxides | |
| (04.GA) Without additional cations | |
| Crystal system: | Monoclinic System |
| Point group (H-M): | 2/m — prismatic |
| Other Properties: | Radioactive. |