Uranophane
(repeating unit)Ca(UO2)2[HSiO4]2·5H2O IMA symbol Urp-α[1] Strunz classification 9.AK.15 Crystal system Monoclinic Crystal class Sphenoidal (2)
(same H-M symbol) Space group P21 Unit cell a = 15.85 Å, b = 6.98 Å
c = 6.64 Å; β = 97.45°; Z = 2 Identification Formula mass 586.36 g/mol Color Light yellow, lemon-yellow, honey-yellow, straw-yellow, green-yellow Crystal habit Crystals occur as stellate needle aggregates; as fibrous crusts, and massive Cleavage {100} Perfect Fracture Uneven Tenacity Brittle Mohs scale hardness 2.5 Luster Vitreous to pearly; waxy or dull when massive Streak Yellowish white Diaphaneity Translucent to subtranslucent Specific gravity 3.81–3.90 Optical properties Biaxial (−) Refractive index nα = 1.643 nβ = 1.666 nγ = 1.669 Birefringence δ = 0.026 Pleochroism Weak; X = colorless; Y = pale canary-yellow; Z = canary-yellow 2V angle 32° to 45°, measured Ultraviolet fluorescence Weak yellow-green under both short and long UV Other characteristics Radioactive References [2][3][4]
(same H-M symbol)
c = 6.64 Å; β = 97.45°; Z = 2
Uranophane (Ca(UO2)2(SiO3OH)2·5H2O), also known as uranotile, is a rare calcium uranium silicate hydrate mineral that forms from the oxidation of other uranium-bearing minerals. It has a yellow color and is radioactive.
Alice Mary Weeks, and Mary E. Thompson of the United States Geological Survey, identified uranophane in 1953.[5]
Classic samples have been produced at Madawaska Mine near Bancroft, Ontario.[6]
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Handbook of Mineralogy
- ^ Uranophane on Mindat.org
- ^ Uranophane on Webmineral
- ^ Moore, James Gregory (1963). Geology of the Mount Pinchot Quadrangle, Southern Sierra Nevada, California. U.S. Government Printing Office.
- ^ McDougall, Raymond (2019-09-03). "Mineral Highlights from the Bancroft Area, Ontario, Canada". Rocks & Minerals. 94 (5): 408–419. doi:10.1080/00357529.2019.1619134. ISSN 0035-7529. S2CID 201298402.
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