Carbonaceous shales, uranium deposits

Furongite was described by the Hunan 230 Laboratory as a yellow, minutely crystalline deposit on carbonaceous shale in the oxidized zone of an illuvial-type uranium deposit. Walenta and Wimmenauer described hallimondite from Lahr, Baden. It is very similar to parsonsite. Pseudo-autunite was characterized by Sergeev from fenitized rocks of the exocontact zone of a massif of ultrabasic-alkaline rocks of northern Karelia, U.S.S.R. Walpurgite-(P), an unnamed phosphate analogue of walpurgite, was described in Soboleva and Pudovkina. ... 

Phosphorites that are richest and thickest and contain the most uranium are the miogeosynclinal type deposited on the outer parts of continental shelves where upwelling of deep marine waters has occurred. These waters were saturated with respect to phosphate and were probably the source of the phosphate in the phosphorites. These phosphorites are commonly present in thick miogeosynclinal sequences, where they are associated with carbonates, black shale, chert, carbonaceous mudstone and minor amounts of mudstone. " The Phosphoria Formation of the western U.S.A. is an example. 

---