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Ferrorosemaryite: [ ]NaFe++Fe+++Al(PO4)3
Comments: B&W PPL image of idiomorphic, semi-opague grains of ferrorosemaryite in white scorzalite. (Eur J Mineralogy, v17:749. Location: Rubindi pegmatite, Rwanda. Scale: See Image. © Eur. J. Mineral
Ferrosaponite: Ca0.3(Fe++,Mg,Fe+++)3(Si,Al)4O10(OH)2·4(H2O)
Comments: Black to greenish black balls of radiating Ferrosaponite crystals on white calcite. Location: Levoberezhye Icelandspar deposit, Nizhuyaya Tunguska river, Evenkiya, Siberia, Russia. Scale: Not Given. © Diederik Visser
Comments: Holotype specimens of earthy ferrosaponite. Location: Russia, Eastern-Siberian Region, Krasnoyarsk Territory, Evenkia, Levoberezhye Iceland Spar Deposit. Scale: FOV 6 cm. © German Type Specimen Catalogue
Ferroselite: FeSe2
Comments: Yellowish silver metallic prismatic ferroselite crystals on matrix. Location: Virgin No. 3 mine, Paradox Valley, Uravan District, Montrose County, Colorado, USA. Scale: See Image. © Rruff Database
Ferrosilite: (Fe++,Mg)2Si2O6
Comments: Transparent, brown prismatic blades of ferrosilite crystals on matrix. Location: Summit Rock, Diamond Lake, Douglas County, Oregon, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Ferrostrunzite: Fe++Fe+++2(PO4)2(OH)2·6(H2O)
Comments: Yellowish acicular crystals of ferrostrunzite. Location: Gravel Hill mine, Perranzabuloe, Cornwall, England, UK. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
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