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Ferroferritschermakite: Ca2(Fe++,Mg)3Fe+++2(Si7Al)O22(OH)2
Comments: Kaveltorp, Kopparberg, Ljusnarsberg, Västmanland, Sweden. Location: Dark amphibolite rock composed of ferri-ferrotschermakite crystals. Scale: Sample Size 3 x 4 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Ferrogedrite: [ ]Fe++5Al2Si6Al2O22(OH)2
Comments: Dark bluish green ferrogedrite grains, with minor matrix.. Location: Kawai mine, Ena City, Gifu Prefecture, Chubu Region, Honshu Island, Japan. Scale: Specimen Size 1.5 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Ferroglaucophane: [ ]Na2(Fe++3Al2)Si8O22(OH)2
Comments: Back-scattered electron images of the ferroglaucophane (FG) schist showing compositional zoning and are fringed with actinolites (thin and lighter-colored parts. (Earth Science Reports, v4:33). Location: Ferroglaucophane schist from the Ohsa-yama area, Okayama Prefecture, Japan. Scale: Scale Bar 100 µm. © Okayama University
Ferrohexahydrite: Fe++SO4ˇ6(H2O)
Comments: White to light brownish crust of ferrohexahydrite on matrix. Location: Sohland, Bautzen, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Ferrohogbomite-2N2S: (Fe++,Zn,Mg,Al)6Al14(Ti,Fe)2O30(OH)2
Comments: Photomicrograph of euhedral ferrohogbomite-2N2S grains (Hog) in magnetite (Mgt). (MinMag, v 67, p 1084). Location: Eastern Ghats belt, Andhra Pradesh, India. Scale: See Image. © Mineralogical Magazine
Ferroholmquistite: [ ](Li2Fe++3Al2)Si8O22(OH)2
Comments: Dark green ferroholmquistite, with silvery luster, prismatic crystalline ferroholmquistite in cesium rich reddish brown biotite. Location: Goltsy, Eastern Sayan Mountains, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferrohornblende: [ ]Ca2[Fe++4(Al,Fe+++)]Si7AlO22(OH)2
Comments: Dark gray prismatic crystal of ferrohornblende in a white feldspar matrix. Location: Monte Somma (Vesuvius), Campania, Italy. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Ferrokentbrooksite: Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2
Comments: A crystal of red ferrokentbrooksite in matrix. Location: Mont Saint-Hilaire, Quebec. Scale: Crystal size 1.5 mm. © László Horváth
Ferrokesterite: Cu2(Fe,Zn)SnS4 Andorite: PbAgSb3S6
Comments: Small, tetragonal crystal of gray ferrokesterite (circled in thumbnail) attached on the surface of a larger striated andorite specimen. Location: San Jose mine, Oruro, Bolivia. Scale: Crystal size 0.2 mm. © John Veevaert
Ferrolaueite: Fe++Fe+++2(PO4)2(OH)2ˇ8(H2O)
Comments: Pale tan microcrystal aggregates of ferro laueite on quartz. Location: My Creek, Burlington County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferromerrillite: Ca9NaFe(PO4)7
Comments: Polished section grain mount of ferromerrillite with analysis.. Location: Meteorite Los Angeles, Shergotite, Martian basalt. Scale: See Image. © Diederik Visser
Ferronickelplatinum: Pt2FeNi
Comments: SEM image of ferronickelplatinum (Fnp), PGE alloys (Al), in a matrix of ferrian chromite (Fe-Chr). (CanMin, v45:631). Location: Loma Peguera chromitites, Cordillera Central, Dominican Republic. Scale: Scale Bar 5 µn. © Canadian Mineralogist
Ferronigerite-2N1S: (Zn,Mg,Fe++)(Sn,Zn)2(Al,Fe+++)12O22(OH)2
Comments: Hexagonal crystal of ferronigerite-2N1S with an inset back-light image showing the deep brown tranparency. Location: Stiepelmann Mine, Arandis, Swakopmund District, Erongo Region, Namibia. Scale: Crystal Size 1.0 x 0.8 x 0.1 cm. © Rob Lavinsky
Ferronigerite-6N6S: (Fe++,Zn)4Sn2(Al,Fe+++)15O30(OH)2
Comments: Brownish ferronigerite-6N6S in matrix. Location: Rosendal tantalum deposit, Rosendal pegmatite, Kemiö (Kimito) Island, Lansi-Suomen Laani, Finland. Scale: Picture Size 3.5 mm. © Thomas Witzke / Abraxas-Verlag
Ferronordite-(Ce): Na3SrCeFe++Si6O17
Comments: Translucent platy pale-brown ferronordite-(Ce) crystals in translucent ussingite. Location: Karnasurt Mountain, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Russia. Scale: Sample Size 12x10x7 mm.. © John Betts - Fine Minerals
Ferronordite-(Ce): Na3SrCeFe++Si6O17 Ferronordite-(La): Na3Sr(La,Ce)FeSi6O17
Comments: Large complex rosette of ferronordite-(La) in center and ferronordite-(Ce) on terminations of platy crystals. Earthy yellowish rhabdophane is Ce dominant. Location: Bolshoi Punkaruaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: FOV is 12x10 mm. © Pavel M. Kartashov
Ferronordite-(La): Na3Sr(La,Ce)FeSi6O17 Ferronordite-(Ce): Na3SrCeFe++Si6O17
Ferropargasite: NaCa2(Fe++4Al)Si6Al2O22(OH)2
Comments: Dark to medium green crystalline granular ferropargasite. Location: Ginevro Mine, Elba, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferrorhodsite: (Fe,Cu)(Rh,Ir,Pt)2S4
Comments: Epoxy grain mount of ferrorhodsite grains. Location: Yukhtochka placer, tributary of South Aldan River, Yakutia, Russia. Scale: Scale Bar 100 µm. © Diederik Visser
Ferrorichterite: Na(CaNa)Fe++5[Si8O22](OH)2
Comments: Brownish-yellow fibrous ferrorichterite on matrix. Location: Brunsheon, Gruvan, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species