NOVACEKITE / METANOVACEKITE Mg(UO2)2(AsO4)2·12H2O / Mg(UO2)2(AsO4)2·4-8H2O (tetragonal)
autunite group

bright yellow crystalline coatings on crystalline gypsum
Las Animas Mine, Municipio do Heuiles Serdan, Chihuahua, Mexico