Ježekite

schrockingerite

uraninite

Formula: Na8[(UO2)(CO3)3](SO4)2.3H2O
Uranyl carbonate-sulfate
Specific gravity: 2.966 calculated
Hardness: 2
Streak: Very pale yellow
Colour: Light yellow to sulphuric yellow
RADIOACTIVE
Environments

Hydrothermal environments

Ježekite is a supergene, low-temperature mineral formed by hydration-oxidation weathering of uraninite associated with post-mining processes (Mindat).

Localities

To date (October 2020) ježekite is known only from the type locality, the Geschieber vein, Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic, as a crystalline crust of thin, bladed prismatic crystals of yellow to sulphuric yellow colour, associated with schröckingerite, gypsum, čejkaite and andersonite (Mindat, https://hal.archives-ouvertes.fr/hal-01575308). Ježekite was approved in 2014. It is a supergene, low-temperature mineral formed by hydration-oxidation weathering of uraninite associated with post-mining processes. It exhibits a bright greenish white fluorescence under both long-wave and short-wave UV (https://hal.archives-ouvertes.fr/hal-01575308).

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