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Dussertite: BaFe+++3(AsO4)2(OH)5
Comments: Light green hexagonal plates of dussertite lining vug associated with quartz and pharmacosiderite. Location: Clara mine, Rankach Valley, Oberwolfach, Wolfach, Black Forest, Baden-Wurttemberg, Germany. Scale: See Image. © Rruff Database
Erionite-Ca: (Ca,K2,Na2)2[Al4Si14O36]·15(H2O)
Comments: Radiating group of colorless acicular hexagonal prisms of erionite-Ca. Location: Moeraki, Otago, South Island, New Zealand. Scale: See Image. © Rruff Database
Erionite-K: (K2,Ca,Na2)2[Al4Si14O36]·15(H2O)
Comments: Randomly oriented colorless prismatic erionite-K crystals in a vug. Location: Chase Creek, Falkland, British Columbia, Canada. Scale: See Image. © Rruff Database
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
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
Fergusonite-beta-(Ce): (Ce,La,Nd)NbO4
Comments: Dark brown vitreous amorphous (metamict) fragments of fergusonite-beta-(Ce). Location: Amherst County, Virginia, USA. Scale: See Image. © Rruff Database
Ferripedrizite: NaLi2(Fe+++2Mg2Li)Si8O22(OH)2
Comments: Black, bladed ferripedrizite crystals. Location: East Pedriza Massif, Sierra de Guadarrama, Spain. Scale: See Image. © Rruff Database
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
Ferroselite: FeSe2
Comments: Yellowish silver metallic prismatic ferroselite crystals on matrix. Location: Virgin No. 3 mine, Paradox Valley, Uravan District, Montrose County, Colorado, USA. Scale: See Image. © Rruff Database