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Glushinskite: Mg(C2O4)·2(H2O)
Comments: SEM photo of two large euhedral glushinskite crystals partially embedded in the dried, rotten saguaro matrix. (AmMin, 88:1883). Location: Crystals associated with the remains of a saguaro, Carnegiea gigantea from south and west central Arizona. Scale: Scale bar 150 µ-m. © American Mineralogist
Comments: White coatings of glushinskite on dirty, tan gypsum. Location: San Simon, Cochise County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gmelinite-Ca: (Ca,Na2)Al2Si4O12·6(H2O)
Comments: Tanslucent, salmon-colored gmelinite-Ca crystals. Location: Sarbaiskoe deposit (Sarbai; Sarbay Mine), Qostaney Oblysy (Kostanai [Kustany] Oblast'), Kazakhstan. Scale: Specimen Size 7.9 x 5.9 x 5.1 cm. © Rob Lavinsky
Gmelinite-K: (K,Na,Ca)6(Al7Si17O48)·22(H2O)
Comments: Pink to reddish brown gmelinite-K crystals in a cavity in matrix. Location: Fara Vicentino, Vicenza, Veneto, Italy. Scale: Not Given. © Diederik Visser
Gmelinite-Na: (Na2,Ca)Al2Si4O12·6(H2O)
Comments: White crystalline aggregate of gmelinite. Location: Antrim, Northern Ireland. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Gobbinsite: (Na2,Ca)2K2Al6Si10O32·12(H2O)
Comments: White opaque crystalline gobbinsite in vug. Location: Island Magee, County, Antrim, Northern Ireland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Godlevskite: (Ni,Fe)9S8
Comments: Brassy metallic godlevskite grains in quartz.. Location: Moapa, Clark Co., Nevada, USA. Scale: Specimen Size 2 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Godovikovite: (NH4)(Al,Fe+++)(SO4)2
Comments: A porous aggregate of massive yellow godovikovite. Location: Carola Mine, Freital, Dresden, Saxony, Germany. Scale: Specimen size 4.2 cm. © Thomas Witzke / Abraxas-Verlag
Goedkenite: (Sr,Ca)2Al(PO4)2(OH)
Comments: Clear, pointed goedkenite crystals epitaxially overgrown on palermoite. Location: Palermo #1 mine, North Groton, Grafton County, New Hampshire, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Goethite: Fe+++O(OH) Laubmannite: Fe++3Fe+++6(PO4)4(OH)12
Comments: Reddish brown goethite hosting radiating sprays of olive green laubmannite to 3 cm across. Location: Buckeye Mountain, Polk County, Arkansas, USA. Scale: 10.5 x 7.5 cm. © John Veevaert
Goethite: Fe+++O(OH)
Comments: Stellate crystalline aggregates of acicular goethite crystals. Location: Pribram, Bohemia, Czech Republic. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals