Uranofana

Infotaula de mineralUranofana

Mineral de la col·lecció del departament de geologia de la Bringham Young University, Utah Modifica el valor a Wikidata
Fórmula químicaCaH₂[(UO₂)(SiO₄)]₂·5H₂O
Epònimurani Modifica el valor a Wikidata
Localitat tipusMiedzianka, Districte de Jelenia Góra, monts Rudawy Janowickie, Baixa Silèsia, Polònia
Classificació
Categoria silicats > nesosilicats
Nickel-Strunz 10a ed.9.AK.15
Nickel-Strunz 9a ed.9.AK.15 Modifica el valor a Wikidata
Nickel-Strunz 8a ed.VIII/A’.14 Modifica el valor a Wikidata
Dana53.3.1.2
Heys14.16.10
Propietats
Sistema cristal·límonoclínic
Hàbit cristal·lícristalls com a agregats d'agulles estelades, com a crostes fibroses, i de manera massiva
Estructura cristal·linaa = 15.85 Å, b = 6.98 Å, c = 6.64 Å; β = 97.45°; Z = 2
Grup puntualMonoclínica esfenoïdal
Grup espacialgrup espacial 4 Modifica el valor a Wikidata
Massa molar586.36
Colorgroc llimona, groc verdós
Exfoliació{100} perfecta
Fracturadesigual
Tenacitatfràgil
Duresa (Mohs)2,5
Lluïssorvítria, les formes terroses son mats
Color de la ratllagroguenca
Diafanitattransparent, translúcida
Gravetat específica3.81 - 3.90
Densitat3.78 g/cm³
Propietats òptiquesbiaxial (-)
Índex de refracciónα = 1.643 nβ = 1.666 nγ = 1.669
Birefringènciaδ = 0.026
Pleocroismefeble; X = incolor; Y = groc canari pàl·lid; Z = groc canari
Angle 2V32° a 45°, mesurat
Fluorescènciafeble groc-verdosa sota raigs UV d'ona curta i llarga
Mineral radioactiu
Més informació
Estatus IMAmineral reanomenat (Rn) i mineral heretat (G) Modifica el valor a Wikidata
Any d'aprovació1853
SímbolUrp Modifica el valor a Wikidata
Referències[1][2]

La uranofana, o uranòtil, és un mineral que pertany al grup dels silicats (nesosilicats). És dimorf de la uranofana-β. Amb la uranofana-β, la boltwoodita i natroboltwoodita forma part del grup de la uranofana.[3] Fins al mes de setembre de 2022 s'anomenava uranofana-α, canviant el nom a l'actual degut a les noves directrius aprovades per la CNMNC per a la nomenclatura de polimorfs i polisomes.[4]

Segons la classificació de Nickel-Strunz, la uranofana pertany a «09.AK: Estructures de nesosilicats (tetraedres aïllats), uranil nesosilicats i polisilicats» juntament amb els següents minerals: soddyita, cuprosklodowskita, oursinita, sklodowskita, boltwoodita, kasolita, natroboltwoodita, uranofana-β, swamboïta, haiweeïta, metahaiweeïta, ranquilita, weeksita, coutinhoïta, ursilita, magnioursilita, calcioursilita i uranosilita.

Als territoris de parla catalana tan sols ha estat descrita a la mina Eureka (La Torre de Cabdella, Pallars Jussà).[5]

Referències

A Wikimedia Commons hi ha contingut multimèdia relatiu a: Uranofana
  1. ↑ «Uranophane». Mindat. [Consulta: 8 setembre 2013].
  2. ↑ Handbook of Mineralogy
  3. ↑ «Uranophane Group». Mindat. [Consulta: 8 setembre 2013].
  4. ↑ Miyawaki, Ritsuro; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. «Newsletter 69». Mineralogical Magazine, 10-2022, pàg. 1–5. DOI: https://doi.org/10.1180/mgm.2022.115 [Consulta: 22 octubre 2022].
  5. ↑ Castillo-Oliver, Montgarri; Melgarejo, Joan Carles; Torró, Lisard; Villanova-de-Benavent, Cristina; Campeny, Marc; Díaz-Acha, Yael; Amores-Casals, Sandra; Xu, Jingyao; Proenza, Joaquin; Tauler, Esperança «Sandstone-Hosted Uranium Deposits as a Possible Source for Critical Elements: The Eureka Mine Case, Castell-Estaó, Catalonia». Minerals, 10, 1, 1-2020, pàg. 34. DOI: https://doi.org/10.3390/min10010034 [Consulta: 6 febrer 2024].

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