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Sklodowskite

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. It has a Mohs... Wikipedia
Crystal class: Prismatic (2/m); (same H-M symbol)
Crystal system: Monoclinic
Formula (repeating unit): Mg(UO2)2(HSiO4)2·5H2O
Space group: C2/m