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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: Långban, 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)6·3(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
Fluckite: CaMn(HAsO4)2·2(H2O)
Comments: White to pale pink crystalline translucent botryoids of fluckite. Location: Giftgrube, Sainte-Marie-aux-Mines, Alsace, Haute-Rhin, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fluellite: Al2(PO4)F2(OH)·7(H2O)
Comments: Tabular, transparent, pseudohexagonal crystals of fluellite. Location: Tom's quarry, Kapunda, South Australia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Fluellite: Al2(PO4)F2(OH)·7(H2O) Bariosincosite: Ba(V++++O)2(PO4)2·4(H2O)
Comments: Vivid green crystals of bariosincosite well placed on a matrix covered by colorless, tabular fluellite with some minor metavariscite. Location: Eugui Quarry, Cantera Azkarate, Eugui, Navarra, Spain. Scale: Rosette size: 0.3 x 0.2 cm. © Fabre Minerals
Fluoborite: Mg3(BO3)(F,OH)3
Comments: Silky fibrous fluoborite with purple fluorite. Location: Ludlaw, San Bernardino County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fluorannite: KFe++3AlSi3O10F2
Comments: Blue crystal of fluorannite on matrix. Location: Katugin Ta-Nb deposit (Katuginskoye deposit), Chitinskaya Oblast', Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Crystal Size 4 mm. © Sergey Vasiliev / Systematic Mineralogy
Fluorbritholite-(Ce): (Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F)
Comments: Amorphous (metamict) grain of fluorbritholite-(Ce) on matrix. Location: Norra Karr, Grena, Jonkoping, Sweden. Scale: Crystal size 1 cm. © John Veevaert