Mineral Specimen Images (W)

Willemseite: (Ni,Mg)3Si4O10(OH)2  
Trevorite: NiFe+++2O4

Comments: Small trevorite crystal in massive willemseite.
Location: Bon Accord, Barberton Mountain, Mpumalanga, South Africa. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Willemseite: (Ni,Mg)3Si4O10(OH)2  
Trevorite: NiFe+++2O4

Comments: Waxy translucent green willemseite with black trevorite in schistose rock.
Location: Near Scotia Talc Mine, Barberton Mountain, Transvaal, Mpumalanga, South Africa. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Willhendersonite: KCaAl3Si3O12·5(H2O)

Comments: Colorless tabular willhendersonite crystals forming a spherical aggregate.
Location: San Venzano Quarry, Terni, Umbria, central Italy. Scale: See Image.
© Rruff Database

Willyamite: (Co,Ni)SbS

Comments: Gray granular massive willyamite.
Location: Consols Lode, Broken Hill, Willyama Township, New South Wales, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Wiluite: Ca19(Al,Mg,Fe,Ti)13(B,Al,[ ])5Si18O68(O,OH)10

Comments: Dark green, blocky wiluite crystal.
Location: Wilui River Region, Russia. Scale: 1-1/8" x 1"..
© Chris Wright / Wrights Rock Shop

Winchite: [ ](CaNa)Mg4(Al,Fe3+)Si8O22(OH)2

Comments: Magenta crystalline winchite in manganese ore.
Location: Tirodi Mines, Madhya Pradesh, India. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Winchite: [ ](CaNa)Mg4(Al,Fe3+)Si8O22(OH)2  
Sodalite: Na8Al6Si6O24Cl2

Comments: Purple sodalite with some crystal faces, supporting a very sharp, transparent winchite crystal, terminated on one end.
Location: Sar-e-Sang, Kokcha Valley, Badakshan Province, Afghanistan. Scale: 11x10x8 mm.
© Richard Dale / Dale Minerals

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

Wiserite: Mn4B2O5(OH,Cl)4

Comments: Pale pink granular wiserite.
Location: Kombat Mine, Kombat, Otjozondjupa, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Witherite: BaCO3

Comments: Specimen of witherite with a rounded (stellate) habit. The lower picture was taken under SW UV light and shows the crystalline aggregates.
Location: Minerva #1 Mine, Hardin County, Illinois, USA. Scale: 5.2 x 4.5 cm.
© John Veevaert

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  
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

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

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

Wolfeite: (Fe++,Mn++)2(PO4)(OH)  
Wicksite: NaCa2(Fe++,Mn++)4MgFe+++(PO4)6·2(H2O)

Comments: Cleaved nodule of fine-grained aggregate of wicksite and wolfeite.
Location: Big Fish River, Yukon, Canada. Scale: 3 x 1.5 cm.
© Dave Barthelmy

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