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Grossular: Ca3Al2(SiO4)3 Diopside: CaMgSi2O6
Comments: Pale blue prismatic crystal of diopside with orange-brown grossular. Location: Val d'Aosta, Italy. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Grossular: Ca3Al2(SiO4)3
Comments: Gemmy, transparent, cinnamon-colored grossular crystals averaging 7 mm in size. Location: Jeffrey mine, Asbestos, Quebec, Canada. Scale: 3.5 x 4 x 1.5 cm. © Dan Weinrich
Grossular: Ca3Al2(SiO4)3 Vesuvianite: Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4
Comments: Blocky, tan-colored vesuvianite with white grossular (garnet). Location: Sierra de la Cruz, Lago Jaco, Coahuila, Mexico. Scale: 3.5 x 4.5 cm. © Fabre Minerals
Groutite: Mn+++O(OH)
Comments: Prismatic crystals of groutite in white marble. Location: Talcville, Saint Lawrence County, New York, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Grumiplucite: HgBi2S4
Comments: Gray crystals of grumiplucite on quartz. Location: Levigliani, Apuan Alps, Lucca Province, Tuscany, Italy. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag
Grunerite: [ ]Fe++7Si8O22(OH)2
Comments: Olive green fibrous crystal aggregates of grunerite in rock matrix. Location: Michigamme, Iron County, Michigan, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gruzdevite: Cu6Hg3Sb4S12
Comments: Black aggregates of gruzdevite in matrix. Location: Moctezuma mine, Sonora, Mexico. Scale: Picture Size 1 cm. © Rhonda Spencer / ASDM Sonoran Desert Digital Library
Guanacoite: (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2
Comments: Deep blue, bladed, glassy crystals of guanacoite to 0.75mm lining vugs of arhbarite.. Location: El Guanaco Mine, Guanaco, Taltal, Antofagasta Province, Chile. Scale: Picture Size 5mm. © Tom Loomis / Dakota Matrix
Guanajuatite: Bi2Se3
Comments: Prismatic crystalline guanajuatite, altering to a blue crust, in white calcite. Location: Falun, Kopparberg, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Guarinoite: (Zn,Co,Ni)6(SO4)(OH,Cl)10·5(H2O)
Comments: Pale pink microcrystalline crust of guarinoite on matrix. Location: Cap Garonne mine, Var, France. Scale: Thumbnail. © Tom Loomis / Dakota Matrix
Gudmundite: FeSbS
Comments: Steel gray metallic crystalline gudmundite, tarnishing, massive in rock. Location: Pezinock, Zapadoslovensky, Slovakia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Guerinite: Ca5(AsO3OH)2(AsO4)2·9(H2O)
Comments: White blebs of guerinite on erythrite. Location: Wechsel Schacht, Richelsdorf, Hesse, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Guildite: CuFe+++(SO4)2(OH)·4(H2O) Magnesiocopiapite: MgFe+++4(SO4)6(OH)2·20(H2O)
Comments: Brown granular guildite with greenish yellow magnesiocopiapite. Location: United Verde Mine, Jerome, Yavapai County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Guilleminite: Ba(UO2)3(SeO3)2O2·3(H2O)
Comments: Radial, yellow aggregates of acicular crystals of guilleminite on green malachite. Location: Musonoi mine, Kolwezi, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Guimaraesite: Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4·6H2O
Comments: Brown guimaraesite spheres and crystal aggregates.. Location: Piaui district, Itinga, Minas Gerais, Brazil. Scale: Specimen size 2 mm. © Diederik Visser
Comments: Botryoidal guimaraesite on eosphorite. Location: Piaul District, Itinga, Minas Gerais, Brazil. Scale: Specimen size 1.1 x 0.9 x 0.8 cm. © Rob Lavinsky
Gunningite: (Zn,Mn)SO4·(H2O)
Comments: White crust of gunningite on massive sulfide ore. Location: Brunswick 12 Open Pit, Bathurst, New Brunswick, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gupeiite: Fe3Si
Comments: BSE image of a gupeiite (1) nodule surrounded by TiO2 (2). Location: Turishkino, Leningrad District, Russia. Scale: See Image. © Diederik Visser
Gustavite: PbAgBi3S6 (?)
Comments: Gray metallic gustavite in matrix. Location: South Mountain, Owyhee County, Idaho, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gutkovaite-Mn: CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5(H2O)
Comments: Pale pink gutkovaite-(Mn) in matrix. Location: Malyi Mannepakhk Mt., Chibiny, Kola, Russia. Scale: Specimen Size 1.5x2 cm. © Diederik Visser