Mineral Specimen Images (U)

Uramphite: (NH4)(UO2)(PO4)·3(H2O)

Comments: Thin encrustions of urampite on a fracture surface in sub-bituminous coal.
Location: Tura-Kavak, Issyk-Kul'skaya Oblast', Kyrgyzstan. Scale: See Image.
© Paul M. Schumacher

Urancalcarite: Ca(UO2)3(CO3)(OH)6·3(H2O)

Comments: Bright yellow earthy spots composed of micro acicular urancalcarite crystals associated with rusty browm huemulite.
Location: Huemul mine, Malargue, Mendoza, Argentina. Scale: Picture size 1.5 cm.
© Tom Loomis / Dakota Matrix

Uraninite: UO2  
Uranophane: Ca(UO2)2SiO3(OH)2·5(H2O)

Comments: Sharp, cubic crystals of black uraninite on yellow uranophane.
Location: Teofilo Otoni, Minas Gerais, Brazil. Scale: Picture size 1.5 mm.
© Paul M. Schumacher

Uraninite: UO2

Comments: Polished slab of black "gummite" ore with the uraninite altering to various secondary uranium minerals in a brecciated matrix.
Location: Ruggles mine, Graton, New Hampshire, USA. Scale: Specimen size 11.4 cm.
© Paul M. Schumacher

Uraninite: UO2

Comments: Black uraninite impregnating coaly wood fragments. You can see the woody structure in detail preserved in the uraninite.
Location: Grants mineral district, Westwater Canyon Member of the Morrison Formation.. Scale: Picture size 5 mm.
© Paul M. Schumacher

Uranmicrolite: (U,Ca)2(Ta,Nb)2O6(OH)

Comments: lack crystals of (most probably) uranmicrolite [originallly labeled samarskite-(Y)) in purple lepidolite matrix.
Location: Brown Derby Mine, Ohio City, Quartz Creek District, Gunnison Co., Colorado, USA. Scale: Specimen Side 3x3x2 cm.
© John Betts - Fine Minerals

Uranocircite: Ba(UO2)2(PO4)2·12(H2O)  
Metauranocircite: Ba(UO2)2(PO4)2·6-8(H2O)

Comments: Brilliant, fluorescent yellow green crystals of uranocircite altered to meta-uranocircite.
Location: Bergen, Vogtland, Saxony, Germany. Scale: 2.3 x 2.2 cm.
© John Veevaert

Uranocircite: Ba(UO2)2(PO4)2·12(H2O)  
Phosphuranylite: KCa(H3O)3(UO2)7(PO4)4O4·8(H2O)

Comments: Yellow, waxy phosphuranylite with green uranocircite in matrix.
Location: Bergen, Falkenstein, Vogtland, Saxony, Germany. Scale: Picture size 0.5 cm.
© Paul M. Schumacher

Uranocircite: Ba(UO2)2(PO4)2·12(H2O)  
Metauranocircite: Ba(UO2)2(PO4)2·6-8(H2O)

Comments: Crystal fragment of uranocircite fracturing due to dehydration to meta-uranocircite. The most common are 100 and 010 fractures, with 110 close behind. But notice the 210 and 410 fractures (breaks) as well.
Location: . Scale: Crystal size 2x3.5 cm.
© Paul M. Schumacher

Uranocircite: Ba(UO2)2(PO4)2·12(H2O)

Comments: Yellowish green square, foliated uranocircite crystal.
Location: Bergen, Falkenstein, Vogtland, Saxony, Germany. Scale: Crystal size 1.3 cm.
© Tom Loomis / Dakota Matrix

Uranophane: Ca(UO2)2SiO3(OH)2·5(H2O)

Comments: Bright yellow crystals of uranophane with black uraninite.
Location: Teofilo Otoni, Minas Gerais, Brazil. Scale: Picture size 3.5 mm.
© Paul M. Schumacher

Uranophane: Ca(UO2)2SiO3(OH)2·5(H2O)  
Uraninite: UO2

Comments: Sharp, cubic crystals of black uraninite on yellow uranophane.
Location: Teofilo Otoni, Minas Gerais, Brazil. Scale: Picture size 1.5 mm.
© Paul M. Schumacher

Uranophane: Ca(UO2)2SiO3(OH)2·5(H2O)

Comments: Yellow uranophane acicular crystal tufts.
Location: Faraday Mine, Bancroft, Ontario, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Uranophane-beta: Ca[(UO2)SiO3(OH)]2·(H2O)

Comments: Bright yellow uranophane-beta crystalline aggregates.
Location: Rossing mine, Rossing, Namibia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Uranopilite: [(UO2)6(SO4)O2(OH)6(H2O)6]·8(H2O)  
Zippeite: K4(UO2)6(SO4)3(OH)10·4(H2O)

Comments: Bright yellow uranopilite and reddish brown zippeite encrustations on uranium ore.
Location: Happy Jack Mine, White Canyon, Utah. Scale: 3 cm.
© John Veevaert

Uranopilite: [(UO2)6(SO4)O2(OH)6(H2O)6]·8(H2O)

Comments: Bright yellow crystalline uranopilite aggregate of prismatic microcrystals.
Location: Jachymov, Northwestern Bohemia, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Uranopilite: [(UO2)6(SO4)O2(OH)6(H2O)6]·8(H2O)  
Johannite: Cu(UO2)2(SO4)2(OH)2·8(H2O)

Comments: Bright yellow rosettes of uranopilite with pale greenish yellow johannite on matrix.
Location: Apex Mine, Lander Co., Nevada, USA. Scale: Picture size 0.5 cm.
© Paul M. Schumacher

Uranopilite: [(UO2)6(SO4)O2(OH)6(H2O)6]·8(H2O)  
Johannite: Cu(UO2)2(SO4)2(OH)2·8(H2O)

Comments: Green aggregates of minute, acicular johannite and yellow uranopilite and clear, tabular aragonite crystals on matrix.
Location: Apex Mine, Lander Co., Nevada, USA. Scale: Picture size 1.5 cm.
© Paul M. Schumacher

Uranopolycrase: (U,Y)(Ti,Nb,Ta)2O6

Comments: Brownish-black uranopolycrase microcrystals on quartz.
Location: Fonte del Prete, near San Piero in Campo, Elba, Tuscany, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Uranopolycrase: (U,Y)(Ti,Nb,Ta)2O6

Comments: Brown to black, paper thin, elongated uranopolycrase crystals to 1mm.
Location: Cavetta Bassa, Elba Isle, Livorno Province, Tuscany, Italy. Scale: Picture size 2 mm.
© Tom Loomis / Dakota Matrix