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Fettelite: [Ag6As2S7][Ag10HgAs2S8]
Comments: Deep scarlet red crystals of fettelite. Location: Glasberg Quarry, Nieder-Beerbach, Odenwald, Hesse, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Fianelite: Mn++2V+++++(V+++++,As+++++)O7ˇ2(H2O)
Comments: Small reddish-brown inclusions of fianelite in matrix. Location: Fianel Mine, Val Ferrera, Grischun (Grisons; Graubünden), Switzerland. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Fibroferrite: Fe+++(SO4)(OH)ˇ5(H2O)
Comments: Tan-white, acicular crystals of fibroferrite on matrix. Location: Lichtenberg Mine, Ronneburg U Deposit, Gera district, Thuringia, Germany. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Fichtelite: C19H34
Comments: Colorless crystals of fichtelite on fossil wood. Location: Marktredwitz, Fichtelgebirge, Bavaria, Germany. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Fiedlerite: Pb3Cl4F(OH)2
Comments: Clear tabular crystals of fiedlerite on matrix. Location: Laurium, Greece. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Filatovite: K[(Al,Zn)2(As,Si)2O8]
Comments: Colorless prismatic single crystal embedded in epoxy, co-type material. Location: Great Tolbachik Eruption (1976), Tolbachik Volcano, Kamchatka Peninsula, Russia. Scale: See Image. © Rruff Database
Filipstadite: (Mn++,Mg)4Sb+++++Fe+++O8 Hausmannite: Mn++Mn+++2O4
Comments: Dark minute grains of filipstadtite in hausmannite (slabbed specimen). Location: Jacobsberg Mine, near Nordmark, Filipstad, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fillowite: Na2Ca(Mn,Fe++)7(PO4)6
Comments: Brown fillowite lining vugs in matrix. Location: Sullivan Mine, Sullivan, New Hampshire. Scale: Specimen Size 4.8 x 3.9 x 1.5 cm. © Rob Lavinsky
Fingerite: Cu11(VO4)6O2
Comments: Black submetallic well-formed prismatic crystals on matrix with black, poorly-formed ziesite. Location: Izalco Volcano, Sonsonate Department, El Salvador. Scale: See Image. © Rruff Database
Finnemanite: Pb5(As+++O3)3Cl
Comments: Black, prismatic, twinned crystal of finnemanite. Location: Lĺngban, Filipstad, Värmland, Sweden. Scale: Crystal length 4.5 mm. © Thomas Witzke / Abraxas-Verlag
Fischesserite: Ag3AuSe2 Klockmannite: CuSe
Comments: Pinkish-grey fischesserite (Fl) with fine-grained bluish-grey klockmannite (Kl) and grey clausthalite (Cl). Polished section from microprobe analysis in reflected light, parallel nicols. Location: Predborice, Bohemia, Czech Republic. Scale: Picture size 0.7 mm. © Thomas Witzke
Fizelyite: Pb14Ag5Sb21S48 (?)
Comments: Galena and sphalerite with minor chalcopyrite and a heavy druse of acicular fizelyite crystals. Location: Herja, Kisbanya, Transylvania, Romania. Scale: Crystal size 3 mm. © John Veevaert
Flagstaffite: C10H22O3
Comments: Colorless transparent microcrystal fragment of flagstaffite. Location: San Francisco Mountains, near Flagstaff, Coconino County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fleischerite: Pb3Ge(SO4)2(OH)6ˇ3(H2O)
Comments: Pale pink transparent acicular crystals of fleischerite. Location: Tsumeb, Oshikoto, Namibia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fletcherite: Cu(Ni,Co)2S4
Comments: Small black crystals of fletcherite in halite. Very unusual association, from a hydrothermal vein cutting a halite deposit. Location: Bernburg, Saxony-Anhalt, Germany. Scale: Picture size 1.2 mm. © Thomas Witzke
Flinkite: Jarosewichite: Mn++3Mn+++(AsO4)(OH)6
Comments: Radial divergent spray of thick prismatic jarosewichite crystals with bladed flinkite crystals. (AmMin, v67:1043). Location: Franklin mine, Franklin, SussexC ounty, New Jersey, USA. Scale: Scale Bar 100 µm. © American Mineralogist
Florencite-(Ce): CeAl3(PO4)2(OH)6
Comments: Butterscotch colored florencite-(Ce) on a quartz crystal. Location: Brumado, Bahia, Brazil. Scale: Crystal size 4 mm. © John Veevaert
Florencite-(La): (La,Ce)Al3(PO4)2(OH)6
Comments: Green, acicular crystalline aggregates of florencite-(La). Location: Igarapé Bahia Mine, Carajás ridge, Pará, North Region, Brazil. Scale: Picture size 4.5 mm. © Thomas Witzke / Abraxas-Verlag
Florencite-(Nd): (Nd,Ce)Al3(PO4)2(OH)6
Comments: Brown earthy pulverulent aggregate of florencite-(Nd) forming a thin coating on matrix. Location: Sausalito Road Quarry, Sausalito, Marin County, California, USA. Scale: See Image. © Rruff Database
Florenskyite: (Fe,Ni)TiP
Comments: Backscattered electron image of the serpentine mass containing bright florenskyite grains (arrow). (AmMin, 85:1083). Location: Kaidun chondritic meteorite, which fell in South Yemen in 1980. Scale: See Image. © American Mineralogist