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Wittichenite: Cu3BiS3
Comments: Black metallic wittichenite in white barite. Location: Schmiedestollen, Wittichen, Black Forest, Baden-Wurttemberg, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Wittite: Pb3Bi4(S,Se)9
Comments: Gray metallic wittite in quartz. Location: Falu Mine, Falun, Kopparberg, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Wodginite: Mn++(Sn,Ta)(Ta,Nb)2O8
Comments: Dark, lustrous crystal of wodginite. Location: Sapucaia do Norte, Galileia, Minas Gerais, Brazil. Scale: 1.3 x 0.7 cm. © John Veevaert
Wohlerite: NaCa2(Zr,Nb)Si2O7(O,OH,F)2 Ferro-edenite: NaCa2Fe++5Si7AlO22(OH)2
Comments: Transparent yellow wöhlerite crystals embedded in pink feldspar and black mica matrix with black ferro-edenite (var. barkevikite). Location: Langesundsfjorden, Sandoya Island, Porsgrunn, Norway. Scale: Specimen Size: 5x5x3.5 cm. © John Betts - Fine Minerals
Wohlerite: NaCa2(Zr,Nb)Si2O7(O,OH,F)2 Biotite: K(Mg,Fe++)3[AlSi3O10(OH,F)2
Comments: Prismatic wohlerite crystals with lepidomelane (Fe-rich biotite). Location: Langevannet, Tvedalen, Telemark, Norway. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Wolframite: (Fe,Mn)WO4
Comments: Dark gray, tabular crystals of wolframite to 2 cm. Carsten Sukatsch collection. Location: Kara-Oba, Republic of Kazakstan. Scale: Picture size 3 cm. © Willibald Büdel
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
Wollastonite-1A: CaSiO3 Stringhamite: CaCuSiO4·2(H2O)
Comments: Rounded aggregate of dark blue stringhamite crystals on bladed, white wollastonite. Location: Christmas mine, Hayden, Gila County, Arizona, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Wollastonite-1A: CaSiO3 Minehillite: (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 Margarosanite: Pb(Ca,Mn++)2Si3O9
Comments: White pearly crystalline minehillite with white margarosanite and dark gray lead, in pale pink opaque wollastonite (distinguished by blue-white fluorescence). Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species