Mineral Specimen Images (F)

Ferrocarpholite: (Fe++,Mg)Al2Si2O6(OH)4

Comments: Pale yellow radiating ferrocarpholite crystals.
Location: Krasno, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferrocarpholite: (Fe++,Mg)Al2Si2O6(OH)4

Comments: Pale yellow radiating ferrocarpholite crystals.
Location: Krasno, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferroceladonite: K2Fe++Fe+++Si8O20(OH)4

Comments: Micaceous ferro celadonite, comprising schistose rock.
Location: Mikhailovsky Mine, Malkhan Range, Central Transbaikalia, Chita District, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferroceladonite: K2Fe++Fe+++Si8O20(OH)4

Comments: Micaceous ferro celadonite, comprising schistose rock.
Location: Mikhailovsky Mine, Malkhan Range, Central Transbaikalia, Chita District, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferro-eckermannite: NaNa2(Fe++4Al)Si8O22(OH)2

Comments: Massive dark green ferro-eckermannite with feldspar.
Location: Khan Bogdo (Khan-Bogdinskii) Massif, Gobi Desert, Mongolia. Scale: Picture Size 7 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferro-eckermannite: NaNa2(Fe++4Al)Si8O22(OH)2

Comments: Massive dark green ferro-eckermannite with feldspar.
Location: Khan Bogdo (Khan-Bogdinskii) Massif, Gobi Desert, Mongolia. Scale: Picture Size 7 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferro-edenite: NaCa2Fe++5Si7AlO22(OH)2  
Wohlerite: NaCa2(Zr,Nb)Si2O7(O,OH,F)2

Comments: Transparent yellow wöhlerite crystals embedded in pink feldspar and black mica matrix with black ferro-edenite (var. barkevikite).
Location: Langesundsfjorden, Sandoya Island, Porsgrunn, Norway. Scale: Specimen Size: 5x5x3.5 cm.
© John Betts - Fine Minerals

Ferro-edenite: NaCa2Fe++5Si7AlO22(OH)2  
Wohlerite: NaCa2(Zr,Nb)Si2O7(O,OH,F)2

Comments: Transparent yellow wöhlerite crystals embedded in pink feldspar and black mica matrix with black ferro-edenite (var. barkevikite).
Location: Langesundsfjorden, Sandoya Island, Porsgrunn, Norway. Scale: Specimen Size: 5x5x3.5 cm.
© John Betts - Fine Minerals

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

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

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

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++SO4·6(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

Ferrohexahydrite: Fe++SO4·6(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

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

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