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Ferrisurite: (Pb,Cu)2-3(CO3)1.5-2(OH,F)0.5-1[(Fe,Al)2Si4O10(OH)2]·n(H2O)
Comments: Olive-green crystalline ferrisurite, with radiating structure. Location: Shirley Ann Claim, near Darwin, Inyo County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferritaramite: Na(CaNa)(Fe++,Mg)3Fe+++2[Si6Al2O22](OH)2 Potassic-ferritaramite:
Comments: Lightly to moderately etched, blocky, jet black ferritaramite (potassic-ferritaramite is a not approved mineral name). Location: Niaslo, Basha Valley, Baltistan, Pakistan. Scale: 5 x 1.5 x 0.3 cm. © John Veevaert
Ferritschermakite: Ca2(Fe++,Mg)3Al2(Si7Al)O22(OH)2
Comments: Dark amphibolite composed of aggregates of ferritschermakite crystals. Location: Elisenvaara S-W Karelia, Russia. Scale: Specimen size: 12x10x6 mm. © Sergey Vasiliev / Systematic Mineralogy
Ferritungstite: (K,Ca,Na)(W++++++,Fe+++)2(O,OH)6·(H2O)
Comments: Small, yellow crystals of ferritungstite on matrix. Location: Clara Mine, Oberwolfach, Wolfach Valley, Black Forest, Baden-Württemberg, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Ferriwinchite: ([ ],Na)(Na,Ca)2(Mg, Fe++)4Fe+++[Si8O22](OH)2
Comments: Deep black-blue bladed single ferriwinchite crystals embedded in white dolomite. Location: Imerina, Madagascar. Scale: See Image. © Rruff Database
Ferro-actinolite: [ ]Ca2Fe++5Si8O22(OH)2
Comments: Prismatic crystals of ferro-actinolite showing terminal crystal faces.. Location: Astor, Shigar Valley Pakistan. Scale: 4.5 x 3.3 x 4.2 cm. © Fabre Minerals
Ferro-aluminotschermakite: Ca2Fe++3Al2(Si7Al)O22(OH)2
Comments: Minute dark green translucent crystals of ferro-aluminotschermakite(?). Location: Aris Quarries (Ariskop Quarry; Railway Quarry), Aris, Windhoek, Windhoek District, Khomas Region, Namibia. Scale: Picture Size 0.4 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Ferro-anthophyllite: [ ]Fe++7Si8O22(OH)2
Comments: TEM image showing a small percentage of Pnma ferroanthophyllite of similar composition is present as thin slabs intergrown parallel to (100) of grunerite and as individual µ-size crystals. Location: Rockport grunerite, Massachusetts, USA. (AmMin, v86:1252). Scale: See Image. © American Mineralogist
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
Ferroalluaudite: NaCaFe++(Fe++,Mn,Fe+++,Mg)2(PO4)3
Comments: Dark green crystalline ferro alluaudite in pegmatite. Location: Chandler Mills Mine, Newport, Sullivan County, New Hampshire, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferrobustamite: Ca(Fe++,Ca,Mn)Si2O6
Comments: Grayish crystalline ferrobustamite with white calcite, golden colored phlogopite and green actinolite. Location: Franklin, Sussex County, New Jersey, USA. 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
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++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
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