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Glaucodot: (Co,Fe)AsS
Comments: Metallic lustered crystal of glaucodot on matrix. Location: Hakansboda, Vastmanland, Sweden. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
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)
Comments: Stellate crystalline aggregates of acicular goethite crystals. Location: Pribram, Bohemia, Czech Republic. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Gonnardite: Na2CaAl4Si6O20·7(H2O)
Comments: White spherical aggregates of gonnardite on matrix. Location: White spherical aggregates of Gonnardite on matrix. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Gordonite: MgAl2(PO4)2(OH)2·8(H2O) Wardite: NaAl3(PO4)2(OH)4·2(H2O)
Comments: Prismatic gordonite crystals on massive wardite. Location: Clay Canyon, Fairfield, Utah County, Utah, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Goyazite: SrAl3(PO4)2(OH)5·(H2O)
Comments: Flat, tabular crystals of goyazite on dolomite. Location: Langenbach quarry, Binntal, Valais, Switzerland. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Greenockite: CdS
Comments: Brown, equant crystal of greenockite on prehnite. Location: Summit, Union County, New Jersey, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
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