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.
Freieslebenite: AgPbSbS3
Comments: Dark gray prismatic crystal of freieslebenite on quartz. Location: Neue Hoffnung Gottes Mine, Bräunsdorf, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Fresnoite: Ba2TiSi2O8
Comments: Yellow to peach colored crystals of fresnoite. Location: Junnila Mine, San Benito County, California, USA. Scale: Crystal size 5 mm. © John Veevaert
Freudenbergite: Na2Fe+++2Ti6O16
Comments: BSE image of a sector-zoned crystal of freudenbergite. The bright pyramids correspond to sector (001), and the darker ones belong to sector (100). Location: Peralkaline alkali syenite dikes at Katzenbuckel, southwestern Germany. Scale: See Image. © Canadian Mineralogist
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
Friedrichite: Pb5Cu5Bi7S18 Krupkaite: PbCuBi3S6 Benjaminite: (Ag,Cu)3(Bi,Pb)7S12
Comments: Crystals of a mixture of friedrichite, krupkaite, and benjaminite, with quartz crystals. Location: Estela Mine, Julcani District, Junin, Peru. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Frohbergite: FeTe2
Comments: Irregular black mssses of frohbergite in quartzite matrix. Location: San Simon Basin (San Simon River; Bowie Chabazite deposit), Bowie area, Cochise Co., Arizona, USA. Scale: Picture Size 2.5 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Frolovite: CaB2(OH)8
Comments: Clear to white crystalline frolovite in rock. Location: Solongo, Republic of Buryatia, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Froodite: PdBi2
Comments: Froodite grain (see arrow) in mostly chalcopyrite matrix. Location: Oktyabr'skoye Mine, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Froodite: PdBi2 Maslovite: PtBiTe Altaite: PbTe
Comments: Reflected light photomicrograph of maslovite (M), froodite (F), and altaite (A), in chalcopyrite matrix. Location: Oktyabr'skoye Mine, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fuenzalidaite: K6(Na,K)4Na6Mg10(SO4)12(IO3)12·12(H2O)
Comments: SEM image of hexagonal (trigonal) crystals of fuenzalidaite. (AmMin, v79:1003). Location: Nitrate mine about I km south of the former plant site of Oficina Santa Luisa, northern Chile. Scale: Scale Bar 10 µm. © American Mineralogist
Fukuchilite: Cu3FeS8
Comments: Dark brown fine-grained fukuchilite in white gypsum. Location: Hanawa Mine, Kazuno City, Akita, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fuloppite: Pb3Sb8S15
Comments: Gray crystals of fülöppite on quartz. Location: Neue Hoffnung Gottes Mine, Bräunsdorf, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Furongite: Al2(UO2)(PO4)3(OH)2·8(H2O)
Comments: Pale yellow crystalline furongite. Location: Furong Lin, Ling Wu, Western Hunan Province, China. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Furutobeite: (Cu,Ag)6PbS4
Comments: Black, prismatic furutobeite crystals. Location: Tsumeb, Namibia. Scale: See Image. © William Pinch
Gabrielite: Tl2AgCu2As3S7
Comments: SEM picture of gabrielite showing the dominant (001) face with striation along a axis and (presumable) twinning along (100). (CanMin, v44:135). Location: Lengenbach locality, at Binntal, Canton Valais, Switzerland. Scale: See Image. © Canadian Mineralogist
Gabrielsonite: PbFe++(AsO4)(OH)
Comments: Jet black, lustrous crystal grain, showing no faces, fractured to about 0.75mm with white pectolite-hematite matrix. Location: Langban, Varmland, Sweden. Scale: 2.5 x 1.5 x 1.5cm. © Tom Loomis / Dakota Matrix
Gadolinite-(Ce): (Ce,La,Nd,Y)2Fe++Be2Si2O10
Comments: Sharp, well crystallized single crystal of brown gadolinite. Location: Buer, Bjørkedalen, Porsgrunn, Telemark, Norway. Scale: 18x14x8 mm. © John Betts - Fine Minerals
Gadolinite-(Y): Y2Fe++Be2Si2O10 Calciogadolinite: CaREE(Fe+++)Be2Si2O10
Comments: Black vitreous, metamict massive gadolinite-(Y) also known as calcian gadolinite. Location: Ytterøya Mine, Røvika, Ytterøya (island), Levanger, Nord-Trondelag, Norway. Scale: See Image. © Rruff Database
Gagarinite-(Y): NaCaY(F,Cl)6
Comments: Brownish to gray crystals of gagarinite-(Y) in matrix. Location: Gjerdingen, Jevnaker, Oppland, Norway. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag