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Uramarsite: (NH4,H3O)2(UO2)2(AsO4,PO4)2·6H2O
Comments: Brownish green cleavage fragment or uramarsite, co-type material. Location: Bota-Burum Uranium deposit, Kazakhstan. Scale: See Image. © Rruff Database
Vertumnite: Ca8Al4(Al4Si5)O12[(OH)36·10(H2O)
Comments: Rosettes of colorless platy vertumnite crystals. Location: Ettringer, Bellerberg Mt, Eifel mountains, Germany. Scale: See Image. © Rruff Database
Vlodavetsite: AlCa2(SO4)2F2Cl·4(H2O)
Comments: Colorless, vitreous, massive vlodavetsite, rarely in irregular plates associated with calcite. Location: Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: See Image. © Rruff Database
Vuoriyarvite-K: (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O)
Comments: Light tan, compact mass of vuoryarvite-K micro-crystals associated with calcite and greenish sodalite. Location: Vein No. 46, Kirovskii apatite mine (Kirovsky Mine; Kirov Mine), Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: See Image. © Rruff Database
Wadsleyite: (Mg,Fe++)2SiO4
Comments: Synthetic wadsleyite crystals. Location: None, laboratory grown. Scale: See Image. © Rruff Database
Wakefieldite-(Y): YVO4
Comments: Black rectangular prisms of wakefieldite-(Y) on matrix. Location: Yellow Lake, British Columbia, Canada. Scale: See Image. © Rruff Database
Walstromite: BaCa2Si3O9
Comments: Colorless massive walstromite with pronounced cleavage, showing strong orange-pink fluorescence under long-wave ultraviolet light in inset image. Location: Esquire number 8 mine, Big Creek, Fresno County, California, USA. Scale: See Image. © Rruff Database
Widenmannite: Pb2(UO2)(CO3)3
Comments: Cotton ball aggregates of tan to colorless acicular crystals of widenmannite on matrix. Location: Pribram, Bohemia, Czechoslovakia. Scale: See Image. © Rruff Database
Willhendersonite: KCaAl3Si3O12·5(H2O)
Comments: Colorless tabular willhendersonite crystals forming a spherical aggregate. Location: San Venzano Quarry, Terni, Umbria, central Italy. Scale: See Image. © Rruff Database
Yttropyrochlore-(Y): (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7
Comments: Vitreous brown metamict yttropyrochlore-(Y). Location: Alakurtti pegmatite, North Karelia, Murmanskaja Oblast', Northern Region, Russia. Scale: See Image. © Rruff Database