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Ferrowodginite: Fe++SnTa2O8
Comments: Dark brown massive ferrowodginite. Location: Nyanga Number 2 Pegmatite, Ankole, Uganda. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferrowyllieite: (Na,Ca,Mn)(Fe++,Mn)(Fe++,Fe+++,Mg)Al(PO4)3
Comments: Deep greenish black massive ferrowyllieite with brown to white quartz. Location: Victory Mine, near Custer, Custer County, South Dakota, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fersilicite: FeSi Ferdisilicite: FeSi2
Comments: Dark grains of ferdisilicite, in sand, intermixed with dark grains of fersilicate. Location: Poltava series, Zachativsk station, Donets (Donetsk) region, Donets'k Oblast' (Donetsk Oblast'), Ukraine. Scale: 0.2 cm field of view. © Jeff Weissman / Photographic Guide to Mineral Species
Fervanite: Fe+++4(VO4)4·5(H2O) Hewettite: CaV6O16·9(H2O)
Comments: Spherical aggregate of acicular microcrystals of fervanite with blocky hewettite. Location: Gold Quarry Mine, Carlin Trend, Eureka County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
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
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
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
Fluoro-sodic-pedrizite: NaLi2(Mg2Al2Li)?5Si8O22F2 Clinoholmquistite: [ ](Li2Mg3Al2)Si8O22(OH)2 Magnesioclinoholmquistite: Li2(Mg,Fe++)3Al2Si8O22(OH)2
Comments: Dark blue fibrous clinoholmquistite with radiating structure, variety magnesioclinoholmquistite. Clinoholmsquitite may be a new aphibole, fluoro-sodic-pedrizite.. Location: Near Murun, Republic of Sakha, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Foitite: [ ]Na<0.5(Fe++,Al)3Al6Si6O18(BO3)3(OH)4
Comments: Dark greenish-black termination of foitite on pinkish elbaite. Location: Dobra Voda, Moravia, Zapadocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Foshagite: Ca4Si3O9(OH)2
Comments: Tan to gray fibrous to columnar aggregate of foshagite. Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Foshallasite: Ca3Si2O7·3(H2O)
Comments: Pearly translucent white somewhat fibrous aggregate of foshallasite. Location: Mount Yukspor, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Francoanellite: H6(K,Na)3(Al,Fe+++)5(PO4)8·13(H2O)
Comments: Chalky massive francoanellite. Location: Giottodi Castellana Cave, Puglia, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Franklinfurnaceite: Ca2(Fe+++,Al)Mn+++Mn++3Zn2Si2O10(OH)8
Comments: Brown resinous mass of franklinfurnaceite, in black franklinite, with white calcite. Location: Franklin Mine, Franklin, Sussex Co., New Jersey, USA. Scale: Picture Size 6 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Franklinite: (Zn,Mn++,Fe++)(Fe+++,Mn+++)2O4 Esperite: PbCa3Zn4(SiO4)4 Hardystonite: Ca2ZnSi2O7
Comments: Pale brown porcelaneous esperite with pinkish gray hardystonite and black franklinite. Location: Franklin, Sussex County, New Jersey. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Franklinphilite: (K,Na)4(Mn++,Mg,Zn)48(Si,Al)72(O,OH)216·6(H2O)
Comments: A cleavage fragment of nearly pure franklinphilite. Location: Franklin mine, Sussex County, New Jersey.. Scale: Fragment Size 2.5 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Franzinite: [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O)
Comments: Opaque white platy crystals of franzinite on brown vesuvianite crystals. Location: Pitigliano, Grosseto, Tuscany, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Freboldite: CoSe
Comments: Copper-red, tarnished, freboldite, as granular material intermixed with darker colored sandstone matrix. Location: Temple Mountain, San Rafael District (San Rafael Swell), Emery Co., Utah, USA. Scale: Specimen Size 2 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Fredrikssonite: Mg2(Mn+++,Fe+++)O2(BO3) Hausmannite: Mn++Mn+++2O4
Comments: Red-brown elongated crystalline fredrikssonite in calcite with granular hausmannite. Location: Langban, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species