Albrechtschraufite

albrechtschraufite

schrockingerite

uraninite

dolomite

Images

Formula: MgCa4F2[UO2(CO3)3]2.17-18H2O
Hydrated uranyl carbonate containing halogen
Crystal System: Triclinic
Specific gravity: 2.6 measured, 2.67 calculated
Hardness: 2 to 3
Streak: White
Colour: Yellow-green
Luminescence: Fluoresces light-bluish green under long wave or short wave UV
Very strongly RADIOACTIVE
Environments

Sedimentary environments

Fluorine is a rare component of uranyl oxysalts; albrechtschraufite is one of only seven known to date (May 2023).

Localities

At the type locality, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic, albrechtschraufite was found in small amounts with schröckingerite on a museum specimen of uranium ore. The albrechtschraufite forms small grain-like subhedral pale yellow-green crystals up to 0.2 mm in size. Associated minerals include schröckingerite, uraninite and dolomite (Mineralogy and Petrology 107.179-188, HOM).

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