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Euchroite: Cu2(AsO4)(OH)·3(H2O)
Comments: Dark green, blocky crystals of euchroite on matrix. Location: Missoula County, Montana, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Eulytite: Bi4(SiO4)3
Comments: Brown, isometric crystals of eulytite on matrix. Location: Schneeberg, Saxony, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
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
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
Ferrierite-Na: (Na,K)2Mg(Si,Al)18O36·9(H2O)
Comments: Rounded crystalline aggregate of yellow to brown ferrierite. Location: Monte Lake, British Columbia, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Ferrohornblende: [ ]Ca2[Fe++4(Al,Fe+++)]Si7AlO22(OH)2
Comments: Dark gray prismatic crystal of ferrohornblende in a white feldspar matrix. Location: Monte Somma (Vesuvius), Campania, Italy. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Ferrosilite: (Fe++,Mg)2Si2O6
Comments: Transparent, brown prismatic blades of ferrosilite crystals on matrix. Location: Summit Rock, Diamond Lake, Douglas County, Oregon, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Fiedlerite: Pb3Cl4F(OH)2
Comments: Clear tabular crystals of fiedlerite on matrix. Location: Laurium, Greece. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Fluellite: Al2(PO4)F2(OH)·7(H2O)
Comments: Tabular, transparent, pseudohexagonal crystals of fluellite. Location: Tom's quarry, Kapunda, South Australia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals