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Gartrellite: Pb(Cu,Fe++)2(AsO4,SO4)2(CO3,H2O)0.7
Comments: Lime green gartrellite on matrix associated with mimetite. Former Martín Oliete Fontela collection. Location: Tsumeb mine, Tsumeb, Namibia. Scale: 6x4x3 cm. © Fabre Minerals
Garyansellite: (Mg,Fe+++)3(PO4)2(OH,O)ˇ1,5(H2O)
Comments: Brown crystalline garyansellite with quartz. Location: Rapid Creek, Yukon Territory, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gasparite-(Ce): CeAsO4
Comments: Crude gasparite-(Ce) crystal possibly pseudomorphous after synchysite. Location: Mount Cervandone,Devero Valley, Baceno, Ossola Valley, Piedmont, Italy. Scale: Crystal Size 2 mm. © Carlo Guidarin
Gaspeite: (Ni,Mg,Fe++)CO3
Comments: Green, crystalline massive gaspeite in matrix. Location: Lemieux Township, Gaspe Peninsula, Gaspe Nord County, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gatelite-(Ce): (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3
Comments: B&W image of crystals of gatelite-(Ce). (AmMin, v88:223). Location: Trimouns talc deposit, Luzenac, Ariege, French Pyrenees. Scale: Crystal Length 700 µm. © R. Vernet / American Mineralogist
Gatumbaite: CaAl2(PO4)2(OH)2ˇ(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
Gatumbaite: CaAl2(PO4)2(OH)2ˇ(H2O) Burangaite: (Na,Ca)2(Fe++,Mg)2Al10(PO4)8(OH,O)12ˇ4(H2O)
Comments: Small, blue burangaite crystals in beige gatumbaite. Location: Horrsjoberg, Torby, Värmland, Sweden. Scale: Micro-mount Size. © Sonke Stolze / Systematic Minerals
Gaudefroyite: Ca4Mn+++3-x(BO3)3(CO3)(O,OH)3
Comments: Dark gray, prismatic gaudefroyite with crystals to 1.5 cm. Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 7.8 x 4.2 cm. © John Veevaert
Gaylussite: Na2Ca(CO3)2ˇ5(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)5ˇ(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
Gedrite: [ ]Mg5Al2Si6Al2O22(OH)2 Magnesiogedrite: (Mg,Fe++)5Al2Si6Al2O22(OH)2
Comments: Dark gray cleavage fragment of magnesiogedrite (gedrite). Location: Bamble, Telemark, Norway. Scale: See Image. © Rruff Database
Geffroyite: (Ag,Cu,Fe)9(Se,S)8
Comments: Silvery-gray grains of geffroyite to <0.5mm embedded in tan barite matrix. Location: Moctezuma mine, Moctezuma, Sonora, Mexcio. Scale: Overall: 3 x 2 x 2 cm. © Tom Loomis / Dakota Matrix
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
Comments: Contact area between vesuvianite (right) and gehlenite (left). Note the lamellae of clintonite included mainly in the gehlenite crystals (CanMin v. 41. p 1259). Location: Skarns along the contact of a diorite intrusion at Oravit¸a, Banat, in Romania. Scale: Image size 2.7 mm. © Canadian Mineralogist
Geigerite: Mn5(AsO3OH)2(AsO4)2ˇ10(H2O)
Comments: Small, brownish grains of transparent geigerite (see lower image) in a silicous breccia. Location: Mt. Nero Mine, Borghetto di Vara, La Spieza, Italy. Scale: 3.5 x 1.5 cm. © Rich Geiger
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+++++2O7ˇ3(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
Genkinite: (Pt,Pd)4Sb3
Comments: Genkinite (3), with a typical rim of an undetermined oxidation product (darker grey), closely associated with platarsite (2) and Pt-Fe alloy (1). Chromite crystals (4). Location: In the Onverwacht and Driekop mines, Transvaal, South Africa. (CanMin, v15:389). Scale: See Image. © Canadian Mineralogist
Genthelvite: Zn4Be3(SiO4)3S
Comments: Pyramidal crystals of genthelvite. Location: Mont St. Hilaire, Quebec, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals