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Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

John Betts - Fine Minerals, New York. Dealers of Fine Minerals and Natural Crystal Clusters since 1989. We buy rock collections, we buy gem collections, we buy mineral collections.

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's Image Gallery With 4041 Images

Fluoropargasite Image

Images:

Fluoropargasite: NaCa2(Mg3Fe++Al)5(Si6Al2O22)F2

Comments: Brown crystal of fluoropargasite.
Location: Edenville, Orange Co., New York, USA. Scale: specimen size is 11.0 X 8.0 X 7.0 cm.
© Erik Rutnik / New York State Museum

Fluorophlogopite Image

Images:

Fluorophlogopite: KMg3(AlSi3)O10F2

Comments: Books of fluorphlogopite from a magnesian skarn showing the basal cleaveage of the micas..
Location: Arebilovskoe phlogopite deposit, Aldan, Aldan Shield, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia. Scale: Specimen size is 3.5x2.5x0.8 cm.
© Pavel M. Kartashov

Fluororichterite Image

Images:

Fluororichterite: Na(CaNa)Mg5[Si8O22]F2

Comments: Doubly-terminated, stubby, black fluororichterite crystal.
Location: Wilberforce, Monmouth Township, Haliburton Co., Ontario, Canada. Scale: 22x21x15 mm.
© John Betts - Fine Minerals

Fluorvesuvianite Image

Images:

Fluorvesuvianite: Ca19(Al,Mg)13[SiO4]10[Si2O7]4(F,OH)10

Comments: Acicular crystals of fluorvesuvianite in a clear, calcite matrix. (CanMin, v 41, p 1375).
Location: Lupikko iron mine, Pitkaranta, Karelia, Russia. Scale: Picture size 1.2 cm.
© Canadian Mineralogist

Foggite Image

Images:

Foggite: CaAl(PO4)(OH)2·(H2O)

Comments: Bright yellow, rounded crystalline aggregates of foggite on matrix.
Location: Palermo #1 mine, North Groton, Crafton County, New Hampshire, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Foitite Image

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Foitite: [ ]Na<0.5(Fe++,Al)3Al6Si6O18(BO3)3(OH)4

Comments: Dark greenish-black termination of foitite on pinkish elbaite.
Location: Dobra Voda, Moravia, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Foordite Image

Images:

Foordite: Sn++(Nb,Ta)2O6

Comments: Brownish massive foordite.
Location: Manono, Shaba (Katanga), Congo (Zaïre). Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Footemineite Image

Images:

Footemineite: Ca2Mn++Mn++2Mn++2Be4(PO4)6(OH)4·6H2O

Comments: Yellow, barrel-shaped, prismatic footemineite crystal (AmMin v93:2.
Location: Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, U.S.A. Scale: Crystal size 0.8 mm.
© American Mineralogist

Fornacite Image

Images:

Fornacite: Pb2Cu(CrO4)(AsO4)(OH)

Comments: Dark, prismatic crystals of fornacite on matrix.
Location: El Khun mine, Anarak, Iran. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Fornacite Image

Images:

Fornacite: Pb2Cu(CrO4)(AsO4)(OH)

Comments: Emerald green platy crystals to 0.75mm on a pink to white, siliceous matrix.
Location: Lone Star mine, Copperopolis, Yavapai County, Arizona. Scale: Picture size 1.4 cm.
© Tom Loomis / Dakota Matrix

Forsterite Image

Images:

Forsterite: Mg2SiO4
Olivine: (Mg,Fe)2SiO4

Comments: Peridot (Forsterite) recrystallized at the base.
Location: Skardu, Nooristan, Pakistan. Scale: 2.5 x 2.7 cm.
© Fabre Minerals

Foshagite Image

Images:

Foshagite: Ca4Si3O9(OH)2

Comments: Tan to gray fibrous to columnar aggregate of foshagite.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Foshallasite Image

Images:

Foshallasite: Ca3Si2O7·3(H2O)

Comments: Pearly translucent white somewhat fibrous aggregate of foshallasite.
Location: Mount Yukspor, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Fourmarierite Image

Images:

Fourmarierite: Pb(UO2)4O3(OH)4·4(H2O)

Comments: Thick tabular orange crystals of fourmarierite.
Location: Shinkolobwe mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Fraipontite Image

Images:

Fraipontite: (Zn,Al)3(Si,Al)2O5(OH)4
Zaccagnaite: Zn4Al2(OH)12(CO3)·3(H2O)

Comments: Scanning electron microscope image of hexagonal, tapering, prismatic zaccagnaite crystals, covered by a thin crust of fraipontite. (AmMin 86:1294).
Location: Marble quarries of the Carrara basin (Apuan Alps, Italy). Scale: See Image.
© American Mineralogist

Fraipontite Image

Images:

Fraipontite: (Zn,Al)3(Si,Al)2O5(OH)4
Zinalsite: Zn2AlSi2O5(OH)4·2(H2O) (?)
Smithsonite: ZnCO3

Comments: Pearly white, sub-mm fraipontite (zinalsite) crystals associated with green smithsonite.
Location: Lavrion District Mines, Lavrion District, Attikí (Attica; Attika) Prefecture, Greece. Scale: Specimen Size 1.4 x 1.0 x 0.9 cm.
© Rob Lavinsky

Francevillite Image

Images:

Francevillite: (Ba,Pb)(UO2)2V2O8·5(H2O)
Chervetite: Pb2V2O7

Comments: Bottle brown tabular crystals of chervetite on yellow francevilleite.
Location: Mounana, Haut-Ogoue, Gabon. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Francevillite Image

Images:

Francevillite: (Ba,Pb)(UO2)2V2O8·5(H2O)
Curienite: Pb(UO2)2V2O8·5(H2O)

Comments: Intense yellow curienite and orange francevillite.
Location: Mouonana, Haut-Ogoue, Gabon. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Francevillite Image

Images:

Francevillite: (Ba,Pb)(UO2)2V2O8·5(H2O)

Comments: Specimen of orange francevillite with minor yellow curienite.
Location: Mouana Mine, Gabon. Scale: Crystal size 4 mm.
© John Veevaert

Francevillite Image

Images:

Francevillite: (Ba,Pb)(UO2)2V2O8·5(H2O)
Mounanaite: PbFe+++2(VO4)2(OH)2

Comments: Stout, yellow, transparent, prismatic, striated crystals of francevillite on brownish red mounanaite matrix.
Location: Mounana mine, Franceville, Haut-Ogooué, Gabon. Scale: Picture size 1.5 cm.
© Paul M. Schumacher

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