Thomas Witzke's Image Gallery

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

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

Geikielite: MgTiO3

Comments: Black, lustrous crystals of geikielite in matrix.
Location: Monte dei tre Abati, Coli, Piacenza Province, Emilia-Romagna, Italy. Scale: Picture size 2.2 mm.
© Thomas Witzke / Abraxas-Verlag

Geminite: Cu++2As+++++2O7·3(H2O)

Comments: Pale greenish crystals of geminite with a light blue, lavendulane-related mineral.
Location: Shaft 371, Schlema-Hartenstein area, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Gerstleyite: Na2(Sb,As)8S13·2(H2O)

Comments: Small prismatic crystals and massive cinnabar-red gerstleyite on matrix.
Location: Baker mine, U.S. Borax Mine, Boron, Kramer District, Kern Co., California, USA. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Getchellite: AsSbS3

Comments: Bright red getchellite on matrix.
Location: Khaidarkan (Chaidarkan) Sb-Hg deposit, Fergana Valley, Osh District, Kyrgyzstan. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Giniite: Fe++Fe+++4(PO4)4(OH)2·2(H2O)

Comments: Dark greenish black crystals of giniite on matrix.
Location: Sandamab, Usakos, Namibia. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Giuseppettite: [Na42K16Ca6]?64Si48Al48O192(SO4)10Cl2·5H2O

Comments: Pale bluish-violet giuseppettite crystals.
Location: Sacrofano, Campagnano, Lazio, Italy. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Gjerdingenite-Fe: K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(H2O)

Comments: Brown crystals of gjerdingenite-Fe on matrix.
Location: Gjerdingen, Vestbygda, Nordmarka, Jevnaker, Oppland, Norway. Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag

Gladite: PbCuBi5S9

Comments: Bluish-gray prismatic crystal of gladite on calcite.
Location: Holzmühlental quarry, Flechtingen, Saxony-Anhalt, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Gladiusite: Fe++2(Fe+++,Mg)4(PO4)(OH)13·H2O

Comments: Radiating group of dark olive-greenish acicular crystals of gladiusite on matrix.
Location: Kovdor Mine, Kovdor massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag

Godovikovite: (NH4)(Al,Fe+++)(SO4)2

Comments: A porous aggregate of massive yellow godovikovite.
Location: Carola Mine, Freital, Dresden, Saxony, Germany. Scale: Specimen size 4.2 cm.
© Thomas Witzke / Abraxas-Verlag

Gold: Au  
Isomertieite: Pd11Sb2As2  
Arsenopalladinite: Pd8(As,Sb)3  
Bornite: Cu5FeS4

Comments: Light grayish grain of intimately intergrown isomertieite and arsenopalladinite (in the center of the picture), with pale yellow gold and brownish to violet bornite. Polished section (from microprobe analysis) in reflected light.
Location: Noril'sk, Putoran Mts, Taymyrskiy Autonomous Okrug, Eastern-Siberian Region, Russia. Scale: Picture size 0.1 mm.
© Thomas Witzke / Abraxas-Verlag

Goldquarryite: (Cu,[ ])(Cd,Ca)2Al3(PO4)4F2(H2O)10{(H2O,F)}2

Comments: Single crystal of goldquarryite.
Location: Gold Quarry mine, Eureka County, Nevada, USA.. Scale: Crystal length 0.5 mm.
© Thomas Witzke / Abraxas-Verlag

Gordaite: NaZn(SO4)(OH)6Cl·6(H2O)

Comments: Colorless to white tabular crystals of gordaite on matrix.
Location: Mansfeld Basin, Saxony-Anhalt, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Gottlobite: CaMg(VO4,AsO4)(OH)

Comments: Orange-brownish tabular crystals of gottlobite with black hausmannite and colorless barite.
Location: Glücksstern Mine, Gottlob Hill, Friedrichroda, Thuringian Forest, Thuringia, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Graemite: CuTeO3·(H2O)

Comments: Blue, massive graemite on quartz.
Location: Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 5.5 mm.
© Thomas Witzke / Abraxas-Verlag

Gramaccioliite-(Y): (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38

Comments: Black, metallic rystals of gramaccioliite-(Y) in matrix.
Location: Sambuco, Pianche di Vinazio, Piemont, Italy. Scale: Picture size 1.3 mm..
© Thomas Witzke

Graphite: C

Comments: A crystal of graphite in gneiss.
Location: Forchheim, Pockau, Erzgebirge, Saxony, Germany. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Grattarolaite: Fe+++3O3(PO4)  
Rodolicoite: Fe+++PO4

Comments: Brown grattarolaite, intimately intergrown with brown rodolicoite.
Location: Castelnuovo Mine, Santa Barbara lignite district, San Giovanni Valdarno, Valdarno (Val d'Arno), Arezzo Province, Tuscany, Italy. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag