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Gatumbaite: CaAl2(PO4)2(OH)2·(H2O) Apatite-(CaF): Ca5(PO4)3F
Comments: White crystalline gatumbaite with yellow brazilianite in massive blue fluorapatite. Location: Buranga Pegmatite, near Gatumba, Gisenyi, Rwanda. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gaylussite: Na2Ca(CO3)2·5(H2O)
Comments: Clear, nearly colorless crystals of gaylussite. Location: Trona, Searles Lake, San Bernardino County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gearksutite: CaAl(OH,F)5·(H2O)
Comments: White gearksutite crust on quartz. Location: Saint Peter's Dome, El Paso County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gedrite: [ ]Mg5Al2Si6Al2O22(OH)2
Comments: Back prismatic crystalline gedrite in rock. Location: Schissgruvan, near Ludvika, Dalarna, Kopparberg, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gehlenite: Ca2Al(AlSi)O7
Comments: Crystalline massive gehlenite. Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Georgbarsanovite: Na12(Mn,Sr,REE)3Ca6Fe++3Zr3NbSi25O76Cl2·H2O
Comments: A small translucent crystalline fragment of georgbarsanovite, from the type locality. Location: Nepheline pegmatite outcrop, Petrelius River, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Fragment Size 0.05 cm,. © Jeff Weissman / Photographic Guide to Mineral Species
Georgeite: Cu++5(CO3)3(OH)4·6(H2O)
Comments: Pale blue crusts of georgeite with dark green atacamite. Location: Carr-Boyd Nickel Mine, Western Australia, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gerasimovskite: (Mn,Ca)(Nb,Ti)5O12·9(H2O) (?) Ussingite: Na2AlSi3O8(OH)
Comments: Pale tan gerasimovskite pseudomorphous after epistolite crystal, in purple ussingite. Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gerhardtite: Cu2(NO3)(OH)3
Comments: Emerald green crystalline crust of gerhardtite on copper. Location: Greenland, Ontonagon County, Michigan, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Germanite: Cu26Fe4Ge4S32
Comments: Red metallic germanite, tarnishing black. Location: Tsumeb, Oshikoto, Namibia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gianellaite: Hg4(SO4)N2
Comments: Yellow crystalline coatings of gianellaite on calcite. Location: Mariposa Mine, Terlingua, Brewster County, Texas, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Giessenite: Pb13(Cu,Ag)(Bi,Sb)9S28 (?)
Comments: Small clumps of acicular crystal mats of giessenite with rounded cosalite grains (as photographed on pure white fibrous backing material). Location: Otome Mine, near Kofu, Yamanashi, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
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
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
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
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