Saleeite

(repeating unit)Mg(UO2)2(PO4)2·10(H2O)Strunz classification08.EB.05Crystal systemMonoclinicSpace groupMonoclinic 2/mUnit cella = 6.951(3) Å, b = 19.947(8) Å, c = 9.896(4) Å, β = 135.17(2)°; Z = 2IdentificationColorLemon-yellow, straw-yellow, greenish yellowCrystal habitCrystals are square plates, composite, flattened on {001}, with {001}, {100}, {120}, {012} (pseudotetragonal indices), to 2.5 cm; commonly in subparallel lamellar aggregates.CleavageOn {001}, perfect; on {010}, {110}, indistinctLusterAdamantine to waxyDiaphaneityTransparent to opaqueSpecific gravity3.27Optical propertiesBiaxial (−) typically nearly uniaxialRefractive indexnα = 1.554 – 1.559 nβ = 1.570 – 1.582 nγ = 1.571 – 1.585Birefringenceδ = 0.027PleochroismX = colorless; Z = pale greenish yellow2V angle2V(meas.) = 0–61°Ultraviolet fluorescenceFluoresces bright lemon-yellow under LW UV, pale yellow under SW UVOther characteristics RadioactiveReferences[1][2][3][4]

Saleeite is a secondary uranium mineral occurring in the oxidized zones of uranium deposits, or as disseminations in carnotite-bearing sandstones. Its chemical formula is Mg(UO2)2(PO4)2·10(H2O).

It was discovered in 1932 at Shinkolobwe, Katanga Province, Democratic Republic of the Congo, and is named for Belgian mineralogist Achille Salée (1883–1932), Professor at Université catholique de Louvain, Belgium. It was later determined that the Katanga mineral was meta-saleeite Mg(UO2)2(PO4)2·8(H2O) and the type locality was assigned to the Weißer Hirsch Mine, Neustädtel, Schneeberg District, Ore Mountains, Saxony, Germany.[5][2]

References

  1. ^ [1] Handbook of Mineralogy
  2. ^ a b [2] Mindat.org
  3. ^ [3] Saleeite Mineral Data
  4. ^ [4] Uranium Minerals
  5. ^ Mrose, Mary E. (1950) American Mineralogist: 35: 525 [5]


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