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Tuhualite: [ ](Na,K)Fe++Fe+++[Si6O15]
Comments: Black, tabular crystals of tuhualite on matrix. Location: Opo Bay, Mayor Island, New Zealand. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Tunellite: SrB6O9(OH)2·3(H2O)
Comments: Clear, prismatic crystals of tunellite on matrix. Location: Death Valley, Inyo County, California, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Turquoise: CuAl6(PO4)4(OH)8·4(H2O)
Comments: Blue, triclinic crystals (rare) of turquoise on matrix. Location: Lynch Station, Campbell County, Virginia, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Tyrolite: CaCu5(AsO4)2(CO3)(OH)4·6(H2O)
Comments: Blue, crystalline aggregates of tyrolite on matrix. Location: Lake Serene mine, Index, Snohomish County, Washington, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Uranophane-beta: Ca[(UO2)SiO3(OH)]2·(H2O)
Comments: Bright yellow uranophane-beta crystalline aggregates. Location: Rossing mine, Rossing, Namibia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Vivianite: Fe++3(PO4)2·8(H2O)
Comments: Transparent, bluish crystal aggregate of vivianite on matrix. Location: Santa Eulalia, Chihuahua, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Wakefieldite-(Ce): (Ce+++,Pb++,Pb++++)VO4
Comments: Bluish black crystal of wakefieldite-(Ce) on matrix. Location: Yellow Lake, Olala, British Columbia, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Walpurgite: Bi4(UO2)(AsO4)2O4·2(H2O)
Comments: Clear, yellow laths of walpurgite crystals. Location: Schneesberg, Saxony, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Wavellite: Al3(PO4)2(OH,F)3·5(H2O)
Comments: Greenish yellow spray of wavellite crystals. Location: Slate Mountains, El Dorado County, California, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Weeksite: K2(UO2)2Si6O15·4(H2O)
Comments: Bright yellow weeksite aggregates. Location: Anderson mine, Yavapai County, Arizona, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals