Mineral Specimen Images (F)

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