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Wilhelmvierlingite: CaMn++Fe+++(PO4)2(OH)·2(H2O) Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5
Comments: Yellow brown crystals wilhelmvierlingite with black rockbridgeite. Location: Hagendorf South Pegmatite (Cornelia Mine; Hagendorf South Open Cut), Waidhaus, Vohenstrauß, Oberpfalz, Bavaria, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Winstanleyite: TiTe++++3O8 Jarosite: KFe+++3(SO4)2(OH)6
Comments: Small, yellow octahedral crystal of winstanleyite on brownish red jarosite. Location: Tombstone, Tombstone District, Cochise Co., Arizona, USA. Scale: Picture size 0.9 mm. © Thomas Witzke / Abraxas-Verlag
Woodwardite: Cu4Al2(SO4)(OH)12·2-4(H2O)
Comments: Greenish-blue botryoidal crust of woodwardite. Location: Green River Formation, Uintah Co., Utah, USA. Scale: Picture size 1.8 mm. © Thomas Witzke / Abraxas-Verlag
Wroewolfeite: Cu4(SO4)(OH)6·2(H2O)
Comments: Blue, lath-shaped crystals of wroewolfeite on matrix. Location: Lichtenberg Mine, Ronneburg U Deposit, Gera district, Thuringia, Germany. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
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
Xanthoconite: Ag3AsS3
Comments: Wine-colored, tabular crystal of xanthoconite on matrix. Location: Schlema, Schlema-Hartenstein area, Erzgebirge, Saxony, Germany. Scale: Picture size 2.5 mm. © Thomas Witzke / Abraxas-Verlag
Yeelimite: Ca4Al6O12(SO4) Ellestadite-(OH): Ca5(SiO4,SO4)3(OH,Cl,F)
Comments: Ye'elimite and hydroxylellestadite intimately intergrown as a brownish aggregate in massive anhydrite. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Yttrotantalite-(Y): (Y,U,Fe++)(Ta,Nb)O4
Comments: Dark greenish-black crystal of Yttrotantalite-(Y). Location: Ytterby, Resarö, Vaxholm, Stockholm, Sweden. Scale: Picture size 8 mm. © Thomas Witzke / Abraxas-Verlag
Yttrotungstite-(Y): YW2O6(OH)3
Comments: Orange crystals of Yttrotungstite-(Y). Location: Kramat Pulai mine, Kinta, Perak, Malaysia. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Zaccagnaite: Zn4Al2(OH)12(CO3)·3(H2O) Zincowoodwardite: [Zn1-xAlx(OH)2][(SO4)x/2(H2O)n]
Comments: White to pale bluish zaccagnaite intimately intergrown with zincowoodwardite. Location: Hilarion Mine, Agios Konstantinos, Lavrion District, Attikí Prefecture, Greece. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag