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Ezcurrite: Na4B10O17·7(H2O)
Comments: Translucent white crystalline massive ezcurrite. Location: Tincalaya, Salta, Argentina. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Faheyite: (Mn,Mg)Fe+++2Be2(PO4)4·6(H2O)
Comments: Cluster of faheyite microcrystals, 0.1 cm across. Location: Roosevelt group (Rough Rider), Custer, Custer District, Custer Co., South Dakota, USA. Scale: Picture Size 15 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Fahleite: Zn5CaFe+++2(AsO4)6·14(H2O)
Comments: Crystalline cleavage fragment of fahleite. Location: Tsumeb, Oshikoto, Namibia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Falkmanite: Pb5Sb4S11
Comments: Metallic black platy striated falkmanite, with bronze luster in spots. Location: Grube Bayerland, Waldsassen, Bavaria, Bayern, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Famatinite: Cu3SbS4 Enargite: Cu3AsS4
Comments: Violet metallic crystalline famatinite with black massive enargite. Location: Cerro de Pasco, Pasco, Peru. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Faustite: (Zn,Cu)Al6(PO4)4(OH)8·4(H2O)
Comments: White botryoidal faustite on matrix. Location: Rain Mine, Eureka County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fedorite: KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O) Charoite: K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)·3(H2O)
Comments: Tan crystalline platy fedorite in pale violet charoite. Location: Murun, Republic of Sakha, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fedorovskite: Ca2(Mg,Mn)2B4O7(OH)6
Comments: Brown crystalline fedorovskite. Location: Solongo, Republic of Buryatia, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Feitknechtite: beta-Mn+++O(OH)
Comments: Brown feitknechtite with pink rhodonite. Location: Ioi Mine, Ritto Cho, Shiga, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Felsobanyaite: Al4(SO4)(OH)10·5(H2O)
Comments: Gray white crystalline micro grains of felsöbanyaite on brown to yellow opal. Location: Cavnik, Felsobanya, Maramures, Romania. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fenaksite: (K,Na,Ca)4(Fe++,Fe+++,Mn)2Si8O20(OH,F)
Comments: Tan to rose colored crystalline fenaksite with dark green-black crystalline pyroxene. Location: Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferberite: Fe++WO4 Anthoinite: AlWO3(OH)3 Cerotungstite-(Ce): (Ce,REE)W2O6(OH)3
Comments: Yellow cerotungstite-(Ce), with black ferberite veins and whitish anthoinite. Location: Bugarama, Rwanda. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferchromide: Cr3Fe1-x(x=0,6)
Comments: Metallic microcrystal of ferchromide. Location: Verkhneivinsk, Sverdlovsk District, Middle Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferdisilicite: FeSi2 Fersilicite: FeSi
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
Fergusonite-(Y): YNbO4 Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)
Comments: Brown resinous fergusonite-(Y) (as per communication with Pavel M. Kartashov) with yellowish plumbopyrochlore. Location: Ploskaya Mountain, Keivy Region, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fermorite: (Ca,Sr)5(AsO4,PO4)3(OH)
Comments: Pinkish crystalline massive fermorite. Location: Sitipar, Chindwara District, India. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fernandinite: CaV8O20·4(H2O)
Comments: Greenish-yellow fernandinite coatings on sandstone. Location: Deremo-Snyder Mine, Egnar, San Miguel County, Colorado. USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Feroxyhyte: Fe+++O(OH)
Comments: Brown botryoidal feroxyhyte. Location: Pachi Limani, Laurium, Attiki, Greece. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferrarisite: Ca5(AsO3OH)2(AsO4)2·9(H2O)
Comments: Translucent crystal spray of ferrarisite on matrix. Location: Gift Grube, Sainte-Marie-aux-Mines, Alsace, Haute-Rhin, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ferricopiapite: Fe+++2/3Fe+++4(SO4)6(OH)2·20(H2O)
Comments: Earthy, yellow ferricopiapite, variety chalcanthite. Location: Bisbee, Cochise County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species