Mineral Specimen Images (G)

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-Ca: K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·6H2O

Comments: Tiny brown fragment of gjerdingenite-Ca.
Location: Pegmatite No. 61, Karnasurt Mt, Lovozero Massif, Kola Peninsula, Russia. Scale: Not Given.
© Sergey Vasiliev / Systematic Mineralogy

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

Gjerdingenite-Fe: K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(H2O)  
Ralstonite: NaxMgxAl2-x(F,OH)6·(H2O)

Comments: SEM photomicrograph of gjerdingenite-Fe. The mineral is dusted with tiny crystals of two phases. At high magnification, one of them is seen to form cubes and is probably ralstonite.
Location: Gjerdingselva, Lunner, Oppland, Oslo Region, Norway. Scale: Crystal length 0.5 mm.
© Canadian Mineralogist

Gjerdingenite-Mn: (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O)  
Elpidite: Na2ZrSi6O15·3(H2O)

Comments: Golden brown crystal of gjerdingenite-Mn, in white elpidite.
Location: Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway. Scale: Crystal Size 0.02 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Gjerdingenite-Na: (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4·5H2O

Comments: Pseudomorphs of gjerdingenite-Na (Gje) after vuonnemite with eudialyte and two generations of aegirine (right part of the specimen). (CanMin, v45:529).
Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Specimen Size 8 cm.
© P. Tarassoff / Canadian Mineralogist

Gjerdingenite-Na: (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4·5H2O

Comments: SEM photomicrographs of gjerdingenite-Na showing a cluster of pseudo hexagonal prismatic crystals on microcline.
Location: Mont Saint-Hilaire, Quebec, Canada. Scale: See Image.
© Canadian Mineralogist

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

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

Comments: SEM photomicrograph showing the morphology of the free-standing crystals of gladiusite. (CanMin v. 38, p 1480).
Location: Kovdor alkaline-ultramafic complex, Kola Peninsula, Russia. Scale: See Image.
© Canadian Mineralogist

Glagolevite: NaMg6[Si3AlO10](OH,O)8·H2O  
Andradite: Ca3Fe+++2(SiO4)3

Comments: Pearly white plates of glagolevite with olive-colored andradite dodecohedrons.
Location: Zheleznyi Mine (Iron Mine), Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 12x10 mm.
© Pavel M. Kartashov

Glauberite: Na2Ca(SO4)2

Comments: Translucent crystals of glauberite.
Location: Superior, Pinal County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Glauberite: Na2Ca(SO4)2  
Hydroglauberite: Na4Ca(SO4)3·2(H2O)

Comments: Putty-colored chalky hydroglauberite on glauberite crystals.
Location: Camp Verde, Yavapai County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Glaucocerinite: (Zn,Cu)5Al3(SO4)1.5(OH)16·9(H2O)

Comments: Botryoidal crust of blue glaucocerinite.
Location: Mina Serpieri, Laurium, Attiki, Greece. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Glaucochroite: CaMnSiO4  
Zincite: (Zn,Mn)O  
Willemite: Zn2SiO4

Comments: Pinkish gray crystalline glaucochroite intermixed with pale green willemite, with dark red zincite and white calcite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Glaucodot: (Co,Fe)AsS

Comments: Metallic lustered crystal of glaucodot on matrix.
Location: Hakansboda, Vastmanland, Sweden. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Glauconite: (K,Na)(Fe+++,Al,Mg)2(Si,Al)4O10(OH)2

Comments: Green glauconite intermixed with quartz.
Location: Ightham, Kent, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Glaucophane: [ ]Na2(Mg3Al2)Si8O22(OH)2

Comments: Pale violet to gray fibrous massive glaucophane.
Location: Lac Malartic, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Glaukosphaerite: (Cu,Ni)2(CO3)(OH)2

Comments: Green botryoidal crust of glaukosphaerite.
Location: Carr-Boyd Nickel Mine, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Glucine: CaBe4(PO4)2(OH)4·0.5(H2O)  
Moraesite: Be2(PO4)(OH)·4(H2O)

Comments: Light brown glucine with white moraesite.
Location: Boevskoye Mine, Sverdlovsk District, Middle Urals, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species