Mineral Specimen Images (F)

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

Feruvite: (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4

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