Mineral Specimen Images (G)

Gabrielite: Tl2AgCu2As3S7

Comments: SEM picture of gabrielite showing the dominant (001) face with striation along a axis and (presumable) twinning along (100). (CanMin, v44:135).
Location: Lengenbach locality, at Binntal, Canton Valais, Switzerland. Scale: See Image.
© Canadian Mineralogist

Gabrielsonite: PbFe++(AsO4)(OH)

Comments: Jet black, lustrous crystal grain, showing no faces, fractured to about 0.75mm with white pectolite-hematite matrix.
Location: Langban, Varmland, Sweden. Scale: 2.5 x 1.5 x 1.5cm.
© Tom Loomis / Dakota Matrix

Gadolinite-(Ce): (Ce,La,Nd,Y)2Fe++Be2Si2O10

Comments: Sharp, well crystallized single crystal of brown gadolinite.
Location: Buer, Bjørkedalen, Porsgrunn, Telemark, Norway. Scale: 18x14x8 mm.
© John Betts - Fine Minerals

Gadolinite-(Y): Y2Fe++Be2Si2O10  
Calciogadolinite: CaREE(Fe+++)Be2Si2O10

Comments: Black vitreous, metamict massive gadolinite-(Y) also known as calcian gadolinite.
Location: Ytterøya Mine, Røvika, Ytterøya (island), Levanger, Nord-Trondelag, Norway. Scale: See Image.
© Rruff Database

Gagarinite-(Y): NaCaY(F,Cl)6

Comments: Brownish to gray crystals of gagarinite-(Y) in matrix.
Location: Gjerdingen, Jevnaker, Oppland, Norway. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Gageite: (Mn,Mg,Zn)42Si16O54(OH)40

Comments: Preserved sprays of inesite completely replaced by tan-colored gageite crystals.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 5 x 4.6 cm.
© John Veevaert

Gahnite: ZnAl2O4

Comments: Deep blue octahedral crystals of gahnite in quartz.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gahnite: ZnAl2O4

Comments: Optical micrograph of gahnite (blue) + Na-Ca-Li mica pseudomorph after staurolite in calcite matrix pigmented with brownish Fe-(hydr)oxide. (AmMin, 88:794).
Location: Diaspore-bearing metabauxite from East Samos (Greece). Scale: See Image.
© American Mineralogist

Gaidonnayite: Na2ZrSi3O9·2(H2O)

Comments: Translucent tan spherical gaidonnayite crystal aggregates.
Location: Mont Saint Hilaire, Rouville County, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gainesite: Na2Zr2Be(PO4)4·1-2(H2O)

Comments: Fragment of intensely blue colored gainesite on paper.
Location: Nevel Quarry (Twin Tunnels; United Feldspar Quarry), Newry, Oxford Co., Maine, USA. Scale: Fragment Size 0.2 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Gaitite: Ca2Zn(AsO4)2·2(H2O)

Comments: Opaque white spherical gaitite with transparent crystalline calcite.
Location: Twin Creeks Mine, Humboldt County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Galaxite: (Mn,Mg)(Al,Fe+++)2O4  
Alleghanyite: Mn5(SiO4)2(OH)2

Comments: Black granular galaxite with reddish alleghanyite and white kutnohorite.
Location: Bald Knob, Alleghany County, North Carolina, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Galeite: Na15(SO4)5F4Cl

Comments: White translucent spherical crystalline aggregates of galeite in clay.
Location: Searles Lake, San Bernardino County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Galena: PbS

Comments: Galena on pyrrhotite. The crystals of galena reach to 1.5 cm across. All are cubic with octahedral modifications.
Location: Dal'Negorsk, Russia. Scale: 8x10 cm.
© John Veevaert

Galena: PbS  
Plumbojarosite: PbFe+++6(SO4)4(OH)12

Comments: Yellow, earthy plumbojarosite on massive, gray galena.
Location: Quarry No 3, Königshain, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Galenobismutite: PbBi2S4

Comments: Black metallic massive galenobismutite in translucent quartz.
Location: Vastervik, Smaland, Kalmar, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Galkhaite: (Cs,Tl)(Hg,Cu,Zn)6(As,Sb)4S12

Comments: Cherry red crystals of galkhaite on matrix.
Location: Getchell mine, Humboldt County, Nevada, USA. Scale: Crystal size 1 mm.
© John Veevaert

Gallite: CuGaS2

Comments: A mixture of massive high grade ore with grains of gallite (gray) occuring with germanite and renierite. Most of what can be seen is the renierite, which has reddish and purple iridescence.
Location: Tsumeb, Namibia. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Gamagarite: Ba2(Fe+++,Mn+++)(VO4)2(OH)

Comments: Dark red-brown crystalline gamagarite in white calcite.
Location: Molinello Mine, Val Graveglia, Genova, Liguria, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ganomalite: Pb9Ca5Mn++Si9O33  
Jacobsite: (Mn++,Fe++,Mg)(Fe+++,Mn+++)2O4

Comments: White crystalline ganomalite with dark granular jacobsite.
Location: Jacobsberg, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species