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Gilalite: Cu5Si6O17·7(H2O)
Comments: Green spherical crystals of gilalite to 0.3mm in grape-like bunches. Location: Christmas mine, Gila Co., Arizona, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Gillardite: Cu3NiCl2(OH)6
Comments: Dark green druze of gillardite and lighter green gasphite in a complex gossenous matrix. Location: 132 North Mine, Widgiemooltha, Western Australia, Australia. Scale: Specimen Size 3.6 x 1.7 x 2.6 cm. © Minservice
Gillespite: BaFe++Si4O10 Anandite: (Ba,K)(Fe++,Mg)3(Si,Al,Fe)4O10(S,OH)2
Comments: Black micaceous anandite with dark red gillespite. Location: Esquire No. 7 Claim, Big Creek, Fresno County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gillespite: BaFe++Si4O10 Pellyite: Ba2Ca(Fe++,Mg)2Si6O17
Comments: Red crystalline gillespite with yellow pellyite rock matrix. Location: GUN claims, Itsi Mountains, MacMillan Pass Area, Yukon Territory, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gillespite: BaFe++Si4O10 Bigcreekite: BaSi2O5·4(H2O) Sanbornite: BaSi2O5
Comments: Tiny white, spherical patterns, halo-like crystals of bigcreekite to about 0.5mm and reddish gillespite in a matrix of pale yellowish sanbornite. Location: Trumbull Peak, Mariposa Co., California, United States. Scale: 2.5 x 2 x 2cm. © Tom Loomis / Dakota Matrix
Gillulyite: Tl2(As,Sb)8S13
Comments: Dark red crystalline gillulyite in white calcite. Location: South Mercur Pit, Barrick Gold Mine, Mercur, Tooele County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gilmarite: Cu3(AsO4)(OH)3
Comments: Scanning electron image of prismatic gilmarite crystals (Eur. J. Mineral, 11:549). Location: Roua deposit, Guillaumes municipality, about 50 km from Nice, France. Scale: Picture size 80 µm. © Eur. J. Mineral
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
Ginorite: Ca2B14O23·8(H2O) Priceite: Ca2B5O7(OH)5·H2O
Comments: Clear platy crystalline coatings of ginorite on rock with white priceite. Location: Corkscrew Canyon, Death Valley, Inyo County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Giorgiosite: Mg5(CO3)4(OH)2·5(H2O)
Comments: Opaque white nodular giorgiosite. Location: Alphroessa, Santorini (Thira) Island, Notion Aiyalon, Greece. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Giraudite: (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 Hakite: (Cu,Hg)3(Sb,As)(Se,S)3
Comments: Polished Section image of giraudite-hakite (gir-hak) with berzelianite (bzl ) and galena (gln). (CanMin, v40:1161). Location: Niederschlema-Alberoda uranium deposit, Erzgebirge, Germany. Scale: See Image. © Canadian Mineralogist
Girdite: Pb3H2(Te++++O3)(Te++++++O6)
Comments: White chalky crystalline spherical massive girdite in rock. Location: Grand Central Mine, Tombstone, Cochise County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Girvasite: NaCa2Mg3(PO4)2[PO2(OH)2](CO3)(OH)2·4(H2O)
Comments: Translucent aggregate of girvasite. Location: Kovdor Mine, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gismondine: Ca2Al4Si4O16·9(H2O)
Comments: Clear crystal of gismondine on matrix. Location: Alban Hills, near Rome, Latium, Italy. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Gittinsite: CaZrSi2O7 Eudialyte: Na4(Ca,Ce)2(Fe++,Mn,Y)ZrSi8O22(OH,Cl)2 (?)
Comments: White crystalline gittinsite with red eudialyte. Location: Kipiwa Complex, Villedieu Township, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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