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Fransoletite: H2Ca3Be2(PO4)4·4(H2O)
Comments: Light blue crystals of fransoletite. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Friedelite: Mn8Si6O15(OH,Cl)10
Comments: Rose red crystals of friedelite on matrix. Location: Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Frondelite: Mn++Fe+++4(PO4)3(OH)5 Kidwellite: Na(Fe+++,Cu)9+x(PO4)6(OH)11·3(H2O)
Comments: Root beer colored crystals of frondelite and white kidwellite sticks on matrix. Location: Sapucaia, Minas Gerais, Brazil. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Genthelvite: Zn4Be3(SiO4)3S
Comments: Pyramidal crystals of genthelvite. Location: Mont St. Hilaire, Quebec, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Georgiadesite: Pb4(AsO3)Cl4(OH)
Comments: Light blue, pseudo-cubic crystal of georgiadesite. Location: Laurium, Greece. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Gilalite: Cu5Si6O17·7(H2O)
Comments: Striated, prismatic pale greenish yellow crystal of gilalite. Location: Christmas mine, Hayden, Gila County, Arizona, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Gismondine: Ca2Al4Si4O16·9(H2O)
Comments: Clear crystal of gismondine on matrix. Location: Alban Hills, near Rome, Latium, Italy. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
Gold: Au Petzite: Ag3AuTe2
Comments: Dark, stubby petzite crystals with native gold on quartz. Location: Rosia Montana (Verespatak), Transylvania, Romania. 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
Gonnardite: Na2CaAl4Si6O20·7(H2O) Tetranatrolite: Na2[Al2Si3O10]·2(H2O)
Comments: White, pseudocubic crystals of tetranatrolite (gonnardite) on matrix. Location: Point of Rocks Mesa, Colfax County, New Mexico, USA. 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
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
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