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Wulfingite: Zn(OH)2
Comments: Colorless equant crystal of wülfingite. Location: Richelsdorf Smelter, Süss, Richelsdorf District, Hesse, Germany. Scale: Picture size 0.8 mm. © Thomas Witzke / Abraxas-Verlag
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
Wurtzite: (Zn,Fe)S Barite: BaSO4
Comments: Compact, dark, metallic crystals of wurtzite intermixed with galena crystals and white barite blades. Location: Huanzala, Huanuco Dept., Peru. Scale: 5 x 4 x 2.5 cm. © Isaias Casanova / IC Minerals
Wustite: FeO
Comments: Orange botryoidal wustite on green calcite. Location: Zacatecas, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Wyartite: Ca3U++++(UO2)6(CO3)2(OH)18·3-5(H2O) Rutherfordine: UO2(CO3)
Comments: Brown, acicular wyartite crystals next to bright yellow rutherfordine tufts. Location: Shinokolbwe mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Wycheproofite: NaAlZr(PO4)2(OH)2·(H2O)
Comments: Pearly, orange-white crystal group of wycheproofite. This is the type specimen for the species by the discoverer, Bill Birch.. Location: A granite quarry near Wycheproof, northwestern Victoria, Australia.. Scale: Crystal size 5 mm tall. © Bill Birch
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