Lepersonnite-(Gd)

lepersonnite-(Gd)

bijvoetite

sklodowskite

rutherfordine

Images

Formula: [Ca_0.5Gd_0.5(H₂O)18(OH)_1.5][Gd(UO₂)₁₂(SiO₃OH)₂(CO₃)₄(OH)₁₀O₂(H₂O)₅]
Valence: [Ca_0.5Gd_0.5(H₂O)18(OH)_1.5][Gd(U⁶⁺O₂)₁₂(SiO₃OH)₂(CO₃)₄(OH)₁₀O₂(H₂O)₅]
Compound carbonate, gadolinium-bearing uranyl mineral
Crystal System: Orthorhombic
Specific gravity: 3.97 measured, 4.01 calculated
Streak: Light yellow
Colour: Bright yellow
RADIOACTIVE
Environments

Sedimentary environments
Hydrothermal environments

Lepersonnite-(Gd) was renamed in 1987 and to date (May 2026) it has been found only at the type locality.

Localities

At the type locality, the Shinkolobwe Mine, Shinkolobwe, Kambove District, Haut-Katanga, DR Congo, lepersonnite occurs as mammilary crusts and as isolated spherules made up of radiating acicular crystals, together with hydrated uranium oxides near primary uraninite in the lower part of the oxidation zone. Associated minerals include bijvoetite, sklodowskite, curite, uranophane, becquerelite, rutherfordine and studtite (AM 68.1248 abstracted from CM 20.231-238).
Lepersonnite-(Gd) from the Shinkolobwe Mine - Image

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