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.
Ferrotschermakite: [ ]Ca2(Fe++3AlFe+++)Si6Al2O22(OH)
Comments: Medium green crystalline massive ferrotschermakite with yellow-brown massive andradite. Location: Old Tip Quarry, Dookie Mineralogical Reserve, Dookie, Victoria, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferrotychite: Na6Fe++2(SO4)(CO3)4
Comments: Yellow crystalline granular ferrotychite in white analcime (drill core). Location: Olenii Ruchei, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferrowinchite: [ ](CaNa)Fe++4(Al,Fe+++)Si8O22(OH)2
Comments: Dark green divergent fibrous ferrowinchite. Location: Harstigen, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Ferruccite: NaBF4 Avogadrite: (K,Cs)BF4
Comments: Very small, white crystals of ferrite on massive, yellowish avogadrite. Location: Vesuvius, Naples, Naples province, Campania, Italy. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Fersilicite: FeSi Xifengite: Fe5Si3
Comments: Reflected light image of cream white grain of xifengite (Xi) with exsolution of white gupeiite (Gu) and grey fersilicite (Fe). Epoxy grain mount. Location: Isovskaya Field, Priasovje, Ukraine. Scale: Picture Size 0.7 mm. © Thomas Witzke
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
Fersmanite: Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3
Comments: Large single crystal of brown fersmanite in quartz matrix. Location: Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: 4x3x2 cm. © John Betts - Fine Minerals
Fersmite: (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6
Comments: Brown prismatic crystal of fersmite in matrix. Location: Alpe Rosso, Vigezzo valley, Novara, Piedmont, Italy. Scale: Picture size 1.7 mm. © Thomas Witzke / Abraxas-Verlag
Feruvite: (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4
Comments: BSE image of a typical zoned feruvite-dravite crystal in quartz. The lighter gray core is feruvite (F), and the darker rim and overgrowths consist of dravite (D). The white grains are chlorapatite.. Location: Tourmalinized rock at Cuvier Island, New Zealand. (CanMin, v27:199). Scale: Scale Bar 100 µm. © Canadian Mineralogist
Comments: Dark green grains of feruvite in matrix. Location: Red Cross Lake, Manitoba, Canada. Scale: See Image. © Rruff Database
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
Fetiasite: (Fe++,Fe+++,Ti++++)3O2(As+++2O5)
Comments: Sub metallic grayish black crystals of fetiasite on matrix. Location: Gorb, Binntal, Wallis (Valais), Switzerland. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
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+++++)O7·2(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)·5(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