Mineral Specimen Images (U)

Uranospathite: Al1-x[ ]x[(UO2)(PO4)]2(H2O)20+3xF1-3x

Comments: Minute, less than 0.1cm platy yellow crystals or uranospahtite on matrix.
Location: Pedro Alvaro, Salamanca, Spain. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Uranosphaerite: Bi(UO2)O2(OH)

Comments: Yellow-orange earthy uranosphaerite crusts.
Location: Kersegalec en Lignol, Vendee, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Uranospinite: Ca(UO2)2(AsO4)2·10(H2O)  
Metauranospinite: Ca(UO2)2(AsO4)2·8(H2O)

Comments: Translucent platy uranospinite (probably dehydrated to metauranospinite) microcrystals on matrix.
Location: Grube Buhlskopf, near Ellweiler, Rheinland-Pfalz, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Uranpyrochlore: (U,Ca,Ce)2(Nb,Ta)2O6(OH,F)  
Samarskite-(Y): (Y,Fe+++,U)(Nb,Ta)5O4

Comments: Deep greenish-brown resinous crystalline massive uranpyrochlore with black samarskite-(Y).
Location: Beryl Hill, near Yinnietharra Station, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Urea: CO(NH2)2

Comments: SEM image of tetragonal prismatic crystals of urea.
Location: Ghar al Hibashi Harrat Nawasif/Al Buqum, Kingdom of Saudi Arabia. Scale: See Image.
© Saudi Geological Survey

Uricite: C5H4N4O3

Comments: White powdery uricite aggregate.
Location: Dingo Donga Cave, near Rawlinna, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Urusovite: Cu[AlAsO5]

Comments: Green urusovite grain.
Location: Northern Breakthrough, Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Crystal length 0.7 mm.
© Thomas Witzke / Abraxas-Verlag

Urvantsevite: Pd(Bi,Pb)2

Comments: Epoxy grain mount of a fragment of urvantsevite (Urv).
Location: Talnakh Cu-Ni deposit, near noril'sk, Krasnoyarsk region, Russia. Scale: See Image.
© Diederik Visser

Ushkovite: MgFe+++2(PO4)2(OH)2·8(H2O)  
Roscherite: Ca(Mn++,Fe++)5Be4(PO4)6(OH)4·6(H2O)

Comments: Translucent ushkovite microcrystals with orange roscherite on feldspar.
Location: Galileia, Minas Gerais, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Usovite: Ba2CaMgAl2F14

Comments: B&W BSE image of a fragment of usovite (Us) and fluorite (Fl) in an epoxy grain mount section.
Location: Pravaya Noiba River (tributary if the Teya), northeastern Enisei Range, Krasnoyarsk region, Russia. Scale: See Image.
© Diederik Visser

Ussingite: Na2AlSi3O8(OH)  
Cuprostibite: Cu2(Sb,Tl)

Comments: Massive ussingite hosting grains of the very rare copper antimony-thallium bearing cuprostibite.
Location: Ilimaussaq, Tasseq, Greenland. Scale: 4.8 x3.4 cm.
© John Veevaert

Ussingite: Na2AlSi3O8(OH)  
Vuonnemite: Na11Nb2TiSi4O12(PO4)2O5F2

Comments: Massive, violet colored ussingite with a single bladed partial crystal of white vuonnemite 1.5 cm in length.
Location: Mt. Karnasurf, Lovozero, Russia. Scale: 4.2 x 3 cm.
© John Veevaert

Ussingite: Na2AlSi3O8(OH)  
Gerasimovskite: (Mn,Ca)(Nb,Ti)5O12·9(H2O) (?)

Comments: Pale tan gerasimovskite pseudomorphous after epistolite crystal, in purple ussingite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Utahite: Cu5Zn3(Te++++++O4)4(OH)8·7(H2O)

Comments: Blue utahite grain in matrix.
Location: Centennial Eureka Mine, Tintic District (East Tintic Mountains), Juab Co., Utah, USA. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Uvanite: U++++++2V+++++6O21·15(H2O)

Comments: Yellowish brown uvanite coating on sandstone.
Location: Temple Rock, Emery County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Uvarovite: Ca3Cr2(SiO4)3

Comments: Green uvarovite (garnet) crystal group.
Location: Mokkivaara mine, Outokumpu, Finland. Scale: 1.3x1.2x1 cm.
© Fabre Minerals

Uvite: (Ca,Na)(Mg,Fe++)3Al5Mg(BO3)3Si6O18(OH,F)4

Comments: Reddish brown, prismatic uvite crystals.
Location: Brumado, Bahia, Brazil. Scale: 4.5 x 5.5 cm.
© Fabre Minerals

Uytenbogaardtite: Ag3AuS2

Comments: Gray crystal grains of uytenbogaardtite to 1mm throughout matrix with electrum.
Location: Bullfrog mine, Nye County, Nevada, USA. Scale: Slab 1cm thick 6x6cm.
© Tom Loomis / Dakota Matrix

Uzonite: As4S5

Comments: Yellow powdery uzonite encrustation.
Location: Uzon Volcano, Kamchatka District, Russian Far East, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species