Mineral Specimen Images (F)

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

Fairbankite: PbTe++++O3  
Jarosite: KFe+++3(SO4)2(OH)6

Comments: Colorless to white crystals of fairbankite with orangish brown jarosite.
Location: Tombstone, Tombstone District, Cochise Co., Arizona, USA. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Fairchildite: K2Ca(CO3)2

Comments: PPL thin-section image of fused wood-ash stone, showing slightly altered lath-shaped cross-sections of fairchildite in a fine groundmass containing buetschliite and calcite. Inset image shows sample.
Location: Kaniksu National Forest, Idaho. (AmMin, v32:607). Scale: Thin Section 30 X.
© American Mineralogist

Fairfieldite: Ca2(Mn,Fe++)(PO4)2·2(H2O)

Comments: Transparent, cockscomb druse of fairfieldite crystals.
Location: Foote mine, Kings Mountain, Cleveland County, North Carolina, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Faizievite: K2Na(Ca6Na)Ti4Li6Si24O66F2

Comments: Pale brownish yellow massive faizievite associated with quartz.
Location: Dara-i-Pioz Glacier, Alayskiy (Alai) Range, Tien Shan Mts, Districts of the Republican Subordination, Tajikistan. Scale: See Image.
© Rruff Database

Falcondoite: (Ni,Mg)4Si6O15(OH)2·6(H2O)

Comments: Solid mass of lime green falcondoite.
Location: Riddle, Douglas County, Oregon. USA. Scale: 4 cm.
© John Veevaert

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

Famatinite: Cu3SbS4

Comments: Dark, purplish black, massive famatinite.
Location: Tertiary volcanic massif, the Serrania de Laurani, Bolivia. Scale: Picture size 2 cm.
© Dave Barthelmy

Fangite: Tl3AsS4  
Lorandite: TlAsS2

Comments: Brown crystals of fangite with red lorandite.
Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Farneseite: (Na37K9Ca10)?56(Si42Al42)?84O168(SO4)12·6(H2O)

Comments: Crystal cluster of farneseite. Shown are the hexagonal truncated pyramid habit and terminations crossed by striations..
Location: Farnese, Viterbo province, Latium, Italy. Scale: Crystal size 1.2 mm.
© Gruppo Mineralogico Romano

Farringtonite: Mg3(PO4)2

Comments: B&W BSE image of a fragment of farringtonite mounted in an epoxy grain mount.
Location: Springwater Pallasite, Saskatchewan, Canada (1931). Scale: See Image.
© Diederik Visser

Faujasite-Ca: (Ca,Na2,Mg)3.5[Al7Si17O48]·32(H2O)

Comments: Isolated colorless octahedra faujasite-Ca in basalt vesicules.
Location: Table Mountain, San Bernardino County, California, USA. Scale: See Image.
© Rruff Database

Faujasite-Mg: (Mg,Na2,Ca)3.5[Al7Si17O48]·32(H2O)

Comments: Colorless octahedra of faujasite-Mg in basalt vesicles.
Location: Limburg Quarries, Sasbach, Kaiserstuhl, Baden-Wurttemberg, Germany. Scale: See Image.
© Rruff Database

Faujasite-Na: (Na2,Ca,Mg)3.5[Al7Si17O48]·32(H2O)

Comments: Intergrown crystals of faujasite coated with opal.
Location: Kaiserstuhl, Baden-Wurttemburg, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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

Fayalite: Fe++2SiO4

Comments: Flattened crystals of fayalite on cristobalite.
Location: Coso Hot Springs, Inyo County, California. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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