Sklodowskite is a uranium mineral with the chemical formula: Mg(UO2)2(HSiO4)2·5H2O.

It is a secondary mineral which contains magnesium and is a bright yellow colour, its crystal habit is acicular, but can form in other shapes.

[2] It is the magnesium analogue of the much more common uranium mineral Cuprosklodowskite, which contains copper instead.

It was discovered by Alfred Schoep [de] (1881–1966) in 1924.

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