Mineral Specimen Images (F)

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)2·8(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

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

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

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

Ferrosaponite: Ca0.3(Fe++,Mg,Fe+++)3(Si,Al)4O10(OH)2·4(H2O)

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