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Wolfeite: (Fe++,Mn++)2(PO4)(OH)
Comments: Opaque massive wolfeite. Location: Wilson's Pegmatite, Broken Hill, New South Wales, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Wolframoixiolite: (Fe,Mn,Nb)(Nb,W,Ta)O4
Comments: Wolframoixiolite crystals in quartz. Location: Zinnwald, Severocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Wonesite: (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2
Comments: Dark greenish black micaceous wonesite flake. Location: Post Pond Volcanics, Wilmount Mountain, Mount Cube Quadrangle, Orange County, Vermont. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Woodruffite: (Zn,Mn++)2Mn++++5O12·4(H2O)
Comments: Dull brown massive woodruffite with limonite. Location: Sterling Mine, Ogdensburg, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Wupatkiite: (Co,Mg,Ni)Al2(SO4)4·22(H2O)
Comments: Pinkish yellow opaque wupatkiite microcrystal in sandstone. Location: Cameroon, Coconino County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Wustite: FeO
Comments: Orange botryoidal wustite on green calcite. Location: Zacatecas, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Wyllieite: (Na,Ca,Mn++)(Mn++,Fe++)(Fe++,Fe+++,Mg)Al(PO4)3
Comments: Dark bluish-black massive wyllieite in pegmatite. Location: Victory Mine, Custer, Custer County, South Dakota, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Xanthoxenite: Ca4Fe+++2(PO4)4(OH)2·3(H2O)
Comments: Xanthoxenite crystalline coating. Location: Palermo Mine, North Groton, Grafton County, New Hampshire, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Xocomecatlite: Cu3Te++++++O4(OH)4
Comments: Green botryoidal xocomecatlite coatings. Location: Mina Bambollita, Moctezuma, Sonora, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Yanomamite: In(AsO4)·2(H2O)
Comments: Gray-blue waxy yanomamite coatings on quartz. Location: Mangabeira Tin Deposit, Goias, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species