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Frolovite: CaB2(OH)8
Comments: Clear to white crystalline frolovite in rock. Location: Solongo, Republic of Buryatia, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Frondelite: Mn++Fe+++4(PO4)3(OH)5 Kidwellite: Na(Fe+++,Cu)9+x(PO4)6(OH)11·3(H2O)
Comments: Root beer colored crystals of frondelite and white kidwellite sticks on matrix. Location: Sapucaia, Minas Gerais, Brazil. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Froodite: PdBi2
Comments: Froodite grain (see arrow) in mostly chalcopyrite matrix. Location: Oktyabr'skoye Mine, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Froodite: PdBi2 Maslovite: PtBiTe Altaite: PbTe
Comments: Reflected light photomicrograph of maslovite (M), froodite (F), and altaite (A), in chalcopyrite matrix. Location: Oktyabr'skoye Mine, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fuenzalidaite: K6(Na,K)4Na6Mg10(SO4)12(IO3)12·12(H2O)
Comments: SEM image of hexagonal (trigonal) crystals of fuenzalidaite. (AmMin, v79:1003). Location: Nitrate mine about I km south of the former plant site of Oficina Santa Luisa, northern Chile. Scale: Scale Bar 10 µm. © American Mineralogist
Fukuchilite: Cu3FeS8
Comments: Dark brown fine-grained fukuchilite in white gypsum. Location: Hanawa Mine, Kazuno City, Akita, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Fuloppite: Pb3Sb8S15
Comments: Gray crystals of fülöppite on quartz. Location: Neue Hoffnung Gottes Mine, Bräunsdorf, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Furongite: Al2(UO2)(PO4)3(OH)2·8(H2O)
Comments: Pale yellow crystalline furongite. Location: Furong Lin, Ling Wu, Western Hunan Province, China. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Furutobeite: (Cu,Ag)6PbS4
Comments: Black, prismatic furutobeite crystals. Location: Tsumeb, Namibia. Scale: See Image. © William Pinch