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:Yellow to orange platy crystals of rüdlingerite (0.1 mm long) with dark orange to red fianelite crystals from Valletta. The image belongs to the article "Rüdlingerite, Mn2+2V5+As5+O7·2H2O, a New Species Isostructural with Fianelite" (https://www.mdpi.com/2075-163X/10/11/960/htm) published with a CC license. Mineral

Fianelite

fianelite

Formula
Mn²⁺2((V,As)2O7) * 2H2O
Fibroferrite crystal aggregates from Le Cetine mine (Siena province, Tuscany, Italy). Photo by Massimiliano Marcelli Mineral

Fibroferrite

fibroferrite

Formula
Fe³⁺(SO4)(OH)·5H2O
Colorless sharp crystals of the rare organic mineral fichtelite on a matrix of fossilied wood. Fichtelite is C19H34 an organic compound also known as Dimethyl-isopropyl-perhydrophenanthrene (also known as norabietane, or more specifically 18-norabietane). From: Wampen, Thiersheim, Fichtelgebirge, Franconia, Bavaria, Germany. Mineral

Fichtelite

fichtelite

Formula
C19H34
Mohs
1
Fiedlerite Locality: Lavrion Port slag locality, Lavrion (Laurion; Laurium), Lavrion District slag localities, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece Picture width 3 mm. Collection and photograph Christian Rewitzer This Photo was Mindat.org Photo of the Day - 2nd Aug 2007 Mineral

Fiedlerite

fiedlerite

Formula
Pb3Cl4F(OH)·H2O
Mohs
3.5
Fiemmeite crystals Mineral

Fiemmeite

fiemmeite

Formula
Cu2(C2O4)(OH)2·2H2O
Mineral

Filatovite

filatovite

Formula
K(Al,Zn)2(As,Si)2O8
Black crystals of the very rare Sb-Mn oxide mineral filipstadite associated to jacobsite from the famous Langban deposit. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Filipstadite

filipstadite
Fillowite Locality: Sullivan Mine, Sullivan, New Hampshire Size: miniature, 4.8 x 3.9 x 1.5 cm Fillowite An exceptionally rich example of a very rare manganese phosphate, that I personally had never even seen. However, I am told by those who know more than I do, that this is a very impressive piece, the best seen on the market certainly and better than a few major private holdings have (one source told me , after thinking about museum holdings he had seen, this may be the richest specimen known). The crystallization is both rich and frankly aesthetic, all things considered. It is on the front and the back. From what research I could do, the locality seems to have not yet been publicly reported to produce this species, although with the old Smithsonian label, I would tend to believe it. Its hard to make this stuff up....and there would have simply been no motive at the time. Exchanged from the Smithsonian to the Academy in the 1920s. Mineral

Fillowite

fillowite

Formula
Na3CaMn²⁺11(PO4)9
Aggregates of tiny yellow finchite crystals on dolomite with colorless celestite. Horizontal field of view is 1.5 mm across Mineral

Finchite

finchite

Formula
Sr(UO2)2(V2O8)*5H2O
Mineral

Finescreekite

finescreekite
Black microcrystals of the extremely rare Cu vanadate fingerite associated to also black mcbirneyite from the TL for both minerals in Izalco volcano in El Salvador, in a matrix of green colored anhydrite probably colored by copper inclusions. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Fingerite

fingerite
Dark brown prismatic crystals of the extremely rare Pb arsenite chloride mineral finnemanite from the TL in Langban (Långban, Filipstad, Värmland County, Sweden). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Finnemanite

finnemanite

Formula
Pb5(As³⁺O3)3Cl
Outstanding metallic crystal aggregates of the extremely rare Au-Ag selenide mineral fischesserite from a locality in De Lamar mine in Idaho (De Lamar Mine, De Lamar, Owyhee County, Idaho, United States of America), in a partially polished specimen that was probably analyzed by the former owner of the specimen. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Fischesserite

fischesserite

Formula
Ag3AuSe2
Pearly white to pinkish plates over 1.5cm of the extremely rare mineral fivegite from the TL (Tsentral'nyi Mine, Rasvumchorr Mountain, Khibiny Massif, Murmansk Oblast, Russian Federation) and only known locality worldwide. Ex-Dr. Igor Pekov's study material with which he described the species. Analyzed by EDS/XRD. Ex. Erich Laskowski collection (USA). Mineral

Fivegite

fivegite

Formula
K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl
Fizélyite Locality: Herja Mine (Kisbánya), Baia Mare (Nagybánya), Maramures County, Romania (Locality at mindat.org) This is an exceptionally rich, rarer, large example of the lead/silver/antimony sulfide Fizelyite. These came out in the early to mid-1900s (and some even earlier) and are often confused with semseyite - although this is much rarer and has obvious differences to the eye, in person. This plate is LOADED with the stuff! It occurs as sharp prismatic crystals to 1 cm or so (flat-laying) on freibergite with jamesonite and semseyite to 1 cm. He bought it from Scott Williams a long time ago and that label is included as well. 13.5 x 7.5 x 2.8 cm Mineral

Fizélyite

fizélyite

Formula
Ag5Pb14Sb21S48
Mohs
2
Mineral

Flaggite

flaggite
White single crystal of the extremely rare organic mineral flagstaffite from the type and only known locality worldwide in Flagstaff (Flagstaff, Coconino County, Arizona, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Flagstaffite

flagstaffite

Formula
C10H22O3
Back-scattered electron (BSE) images of nataliakulikite in larnite-gehlenite rock (holotype sample, W11-3) from Nahal Morag Canyon, Hatrurim Basin, Israel. Ntk—nataliakulikite; Prv—Fe-rich perovskite; Mgf—magnesioferrite; Lar—larnite; Flm—flamite; Gh—gehlenite; Ap—fluorapatite; CAS—hydrated Ca-silicates. Mineral

Flamite

flamite

Formula
(Ca,Na,K)2(Si,P)O4
Mineral

Flatimerite

flatimerite

Formula
[Al13(OH)24(H2O)24][V⁵⁺9V⁴⁺O28]·[(SO4)4(H2O)24]
Mineral

Fleetite

fleetite
Mineral

Fleischerite

fleischerite

Formula
Pb3Ge(SO4)2(OH)6·3H2O
Mineral

Fleisstalite

fleisstalite

Formula
FeSO3·3H2O
Steel grey crystal aggregates of the very rare mineral Cu-Ni sulphide mineral fletcherite from the type locality in Fletcher mine (Fletcher Mine, West Fork, Reynolds County, Missouri, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium Mineral

Fletcherite

fletcherite

Formula
Cu(Ni,Co)2S4
Mineral

Flinkite

flinkite

Formula
Mn²⁺2Mn³⁺AsO4(OH)4
Mohs
4.5