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

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

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

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  
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: 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

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

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

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

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)

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

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

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)  
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