Mineral Specimen Images (F)

Fedotovite: K2Cu++3(SO4)3O  
Chalcanthite: CuSO4·5(H2O)

Comments: Green fedotovite with pale blue chalcanthite.
Location: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Fedotovite: K2Cu++3(SO4)3O  
Dolerophanite: Cu2(SO4)O  
Chalcanthite: CuSO4·5(H2O)

Comments: Brown crystals of dolerophanite with blue chalcanthite and green fedotovite.
Location: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Fedotovite: K2Cu++3(SO4)3O  
Dolerophanite: Cu2(SO4)O  
Chalcanthite: CuSO4·5(H2O)

Comments: Brown crystals of dolerophanite with blue chalcanthite and green fedotovite.
Location: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Fedotovite: K2Cu++3(SO4)3O  
Chalcanthite: CuSO4·5(H2O)

Comments: Green fedotovite with pale blue chalcanthite.
Location: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Feinglosite: Pb2(Zn,Fe)[(As,S)O4]2·(H2O)

Comments: Feinglositc in polished section: (a) PPL light and (b) XPL light. In (a) note the inclusions of goethite (white) in the grey feinglosite (the black areas are holes). In (b) note the white to gray clusters of feinglosite. Black areas are goethite.
Location: Lining a cavity in a sample of massive chalcocite from Tsumeb, Namibia. (MinMag, v61:405). Scale: Picture Width 1 mm.
© Mineralogical Magazine

Feinglosite: Pb2(Zn,Fe)[(As,S)O4]2·(H2O)

Comments: Feinglositc in polished section: (a) PPL light and (b) XPL light. In (a) note the inclusions of goethite (white) in the grey feinglosite (the black areas are holes). In (b) note the white to gray clusters of feinglosite. Black areas are goethite.
Location: Lining a cavity in a sample of massive chalcocite from Tsumeb, Namibia. (MinMag, v61:405). Scale: Picture Width 1 mm.
© Mineralogical Magazine

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

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

Feklichevite: Na11Ca9(Fe+++,Fe++)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5

Comments: Brownish to purplish-brownish crystal of feklichevite.
Location: Kovdor Mine, Kovdor massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Feklichevite: Na11Ca9(Fe+++,Fe++)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5

Comments: Brownish to purplish-brownish crystal of feklichevite.
Location: Kovdor Mine, Kovdor massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

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

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

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

Fencooperite: Ba6Fe+++3Si8O23(CO3)2Cl3·H2O

Comments: Micro black needles of fencooperite in white sanbornite and pinkish gillespite matrix.
Location: Trumbull Peak, Sierra Nevada, Mariposa Co., California, USA. Scale: 2x2x2cm.
© Tom Loomis / Dakota Matrix

Fencooperite: Ba6Fe+++3Si8O23(CO3)2Cl3·H2O

Comments: Micro black needles of fencooperite in white sanbornite and pinkish gillespite matrix.
Location: Trumbull Peak, Sierra Nevada, Mariposa Co., California, USA. Scale: 2x2x2cm.
© Tom Loomis / Dakota Matrix

Ferberite: Fe++WO4

Comments: Ferberite with minor siderite selvage.
Location: Panasqueira (2nd level), in the region of Beira Baixa, Portugal. Scale: 6 x 5 cm.
© Fabre Minerals

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

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

Ferberite: Fe++WO4

Comments: Ferberite with minor siderite selvage.
Location: Panasqueira (2nd level), in the region of Beira Baixa, Portugal. Scale: 6 x 5 cm.
© Fabre Minerals