#uranium minerals

Uranpechblende (mit hohem Tongehalt) als Füllung einer Kluft im sogenannten Lederschiefer, ein Tonschiefer aus dem oberen Ordovizium. Das Schiefergestein ist im Bereich der Uranerzfüllung gebleicht und etwas hämatitisiert. Die abgebildete Erzstufe ist ein typischer Beleg für die reicheren Erze (betriebsintern als Sorte 1 bezeichnet) im Südfeld des Uranerzbergwerkes Reust der SDAG Wismut bei Ronneburg in Thüringen.

Fundort: Uranbergwerk Reust, 345m-Sohle, Block 1133, Überhauen 1133-11/1; 3. Scheibe (ca. 10m über der Sohle); Fundzeitpunkt: 1980

Photo: © All rights reserved by Carsten A. Dunkel, Bad Lobenstein / Thüringen

Uranium pitch (with high clay content) as filling of a cleft in so-called leather shale, a clay shale from the upper Ordovician. The shale is bleached in the area of ​​uranium filling and somewhat hematitized. The illustrated ore stage is a typical example of the richer ores (in-house designated as variety 1) in the southern part of the uranium ore mine Reust of the SDAG Wismut near Ronneburg in Thuringia.

Location: Reust uranium mine, 345m-sole, block 1133, over-cutting 1133-11/1; 3rd disc (about 10m above the sole); Date of discovery: 1980

Autunite is a secondary uranium mineral, named for its type locality near Autun, France, with a chemical formula of Ca(UO2)2(PO4)2·10-12H2O. Autunite ranges in colour from pale yellow and yellow-green to greenish black. It dehydrates to meta-autunite on extended exposure to air, becoming yellower and less greenish.

Autunite fluoresces green-yellow under UV light, and due to its uranium content is radioactive. It may also be used as an ore. It generally occurs in the oxidation zone of uranium-bearing rocks, and is associated with other uranium minerals, such as torbernite and uranophane. Crystals may be tabular or micaceous.

Sources:

Mindat

Webmineral

Wikipedia