Click on thumbnails for a larger image. Please be patient since some of these pages of thumbnail images take some time to load. These mineral photos are copyrighted by their owners and may not be used without permission.
Guimaraesite: Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4·6H2O
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
Gutsevichite: Al3(PO4)2(OH)3·8(H2O)
Comments: White efflorescence of gutsevichite on sandstone. Location: Long Park, Uravan, Montrose County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gypsum: CaSO4·2(H2O)
Comments: Bladed rosettes of gypsum. Location: unknown. Scale: Specimen size 6 cm. © Dave Barthelmy
Comments: Pencil-sized acicular crystals of gypsum. Location: Naica, Chihuahua, S.A., Mexico. Scale: Specimen size 5 cm. © Dave Barthelmy
Gyrolite: NaCa16Si23AlO60(OH)8·64(H2O)
Comments: Two round beige gyrolite aggregates each about 5cm diameter. Location: Bombay, India. Scale: Specimen size 10cm. © John Attard