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Minerals

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Friedelite (brown), rhodonite (pink) and manganese oxides (black). Serrana mine, El Molar (Tarragona), Spain. 5 cm. Coll, and photo Miguel Calvo. Mineral

Friedelite

friedelite

Formula
Mn²⁺8Si6O15(OH,Cl)10
Mineral

Friedrichbeckeite

friedrichbeckeite

Formula
K(☐Na)Mg2(Be2Mg)Si12O30
Mohs
6
Mineraly.sk - friedrichit Mineral

Friedrichite

friedrichite

Formula
Cu5Pb5Bi7S18
Color image of the type specimen, with friisite (white), jagoite (yellow), aegirine–augite (brown), and melanotekite (black). Sample no. GEO-NRM #19610234. Mineral

Friisite

friisite

Formula
Pb8Al3Si8O27Cl3
Reddish brown microcrystals of the extremely rare Mn-uranium mineral fritzcheite from the type locality for the mineral in Georg Wagsfort Mine, Johanngeorgenstadt (Erzgebirge, Saxony, Germany). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Fritzscheite

fritzscheite

Formula
Mn²⁺(UO2)2(PO4,VO4)2·10H2O
Metallic crystal aggregates of the extremely rare Fe telluride mineral frohbergite from Gold Hill, Bowie area, Cochise County, Arizona, United States of America. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Frohbergite

frohbergite

Formula
FeTe2
Locality: Solongo B deposit, Vitim Plateau, Buriatia Republic (Buryatia), Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia Dimensions: 2.4 cm x 1.6 cm x 1.3 cm Frolovite is a very rare anhydrous borate, found in only three localities worldwide (MINDAT). Grayish-white frolovite is encased in the thumbnail matrix on this rare specimen from this unusual skarn deposit. Ex. Josef Vajdak Collection. Mineral

Frolovite

frolovite

Formula
Ca[B(OH)4]2
Frondelite, Phosphosiderite Locality: Buranga pegmatite, Gatumba District, Western Province, Rwanda Size: 4.4 cm x 2.4 cm x 0.4 cm Frondelite and phosphosiderite are rare phosphates and this is an extremely rare combination from this very obscure and unusual, Al-rich phosphate pegmatite. Brown crusts of frondelite and patches of violet phosphosiderite are scattered on both sides of the sliver of matrix. Metastrengite is a synonym of phosphosiderite. Probably material from the 1950s to 1980s. Ex. Gilbert Gauthier and Jacques Montandon Collections. Mineral

Frondelite

frondelite

Mohs
4.5
Metallic inclusions of the two extremely rare palladium-bismuth minerals urvantsevite & froodite from the famous Talnakh deposit (Mayak Mine, Talnakh, Noril'sk, Putoran Plateau, Taimyr Peninsula, Krasnoyarsk Krai, Russian Federation) in a completely analyzed specimen by SEM/EdS. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Froodite

froodite

Mohs
2.5
Mineral

Fuchunite

fuchunite

Formula
Ba(C2H3O3)2(C2H4O3)2
:Yellow crystal aggregates of the very rare mineral iodine mineral fuenzalidaite associated to white nitratine and halite. From: Soledad Mine, Pozo Almonte, Pampa de Tamarugal, I Region, Chile. Iodine minerals are very rare in Nature since only 29 Iodine minerals are known of almost 5500 known minerals. Mineral

Fuenzalidaite

fuenzalidaite
Greenish blue fuettererite aggregates of this extremely rare and relatively new tellurium mineral (IMA 2011-111) from Bird Nest mine (Bird Nest drift, Otto Mountain, Baker, Soda Mountains, San Bernardino County, California, United States of America). Mineral

Fuettererite

fuettererite

Formula
Pb3Cu²⁺6Te⁶⁺O6(OH)7Cl5
Mineral

Fukalite

fukalite

Formula
Ca4[Si2O6][CO3](OH)2
Fukuchilite exhibited at the Mining Museum of Akita University Mineral

Fukuchilite

fukuchilite

Formula
Cu3FeS8
Mohs
6
Mineral

Fulbrightite

fulbrightite
C60 Buckminsterfullerene, crystallized. From the Leopold-Franzens-Universität Innsbruck. Mineral

Fullerite

fullerite
Outstanding yellow crystal aggregates of the extremely rare uranium mineral furongite from one of the only two known localities worldwide: Kobokobo Pegmatite, Mwenga, South Kivu, DR Congo. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Furongite

furongite

Formula
Al13(UO2)7(PO4)13(OH)14 * 58H2O
Furutobeite, Quartz, Tennantite Locality: Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia (Locality at mindat.org) Size: 2.7 x 2.6 x 1.8 cm. This exceedingly rare species occurs as hackly, black crystals, to .5 cm across, associated with .5 cm in length, colorless quartz crystals. Both of these species are on earlier formed, blocky, dark gray crystals of tennantite, up to 1.0 cm across. This specimen has exceptional crystals, starkly perched on contrasting matrix because of the quartz sprays. Analyzed by Dr. Marcus Origlieri. Ex. Uli Bahmann Collection. Mineral

Furutobeite

furutobeite
Mineral

Fuyuanite

fuyuanite

Formula
Mg7Nb6O18(OH)8
Fülöppite Locality: Dealul Crucii Adit (Crucii Hill; Kreuzberg; Kereszthegy), Baia Mare (Nagybánya), Maramures Co., Romania Picture width 1 mm. Collection and photograph Christian Rewitzer Mineral

Fülöppite

fülöppite

Mohs
2.5
Very small isolated black crystal of the extremely rare Lengenbach mineral gabrielite (IMA 2002-053). Gabrielite is one of the rarest Lengenbach mineral species. Only very few specimens known. After the book "Faszination Lengenbach (2008)" we know that the total number of gabrielite specimens known worldwide was only 2 !! (p.188) Analyzed specimen by EDX and XRD by F.Nestola of Padua. Specimen found in 1993. Official L-Number is L25259. Ex-Dr.T.Raber collection. Mineral

Gabrielite

gabrielite

Formula
Tl2AgCu2As3S7
Mineral

Gabrielsonite

gabrielsonite

Formula
PbFe³⁺(As³⁺O3)O
Mineral

Gachingite

gachingite
Gadolinite-(Ce) Locality: Tuftane (Tuftan; Tuptane), Frikstad (Frigstad), Iveland, Aust-Agder, Norway (Locality at mindat.org) Size: small cabinet, 8.2 x 7.1 x 5.2 cm Gadolinite-(CE) A huge gadolinite crystal from one of the old classic locales for this species, and from the John Sinkankas collection. It masses 583 grams which is VERY hefty when held, and is a giant crystal - the big ones seldom maintain such sharp form. Sinkankas, a renowned author and collector, noted its value as $125 in 1968 (he purchased for a bargain price of $20 in 1965 - but that was a lot of money then, too, for an ugly rock!), and wrote that it is "Very large, sharp, and exceptional" on his original label, an index card in his hand which accompanies the piece. I purchased this directly from John at his home in San Diego in about 1998, and sold it to collector Bob Nowakowski , who had a large suite of exceptional crystals of the Rare Earth Elements species. He held it until recently. Mineral

Gadolinite-(Ce)

gadolinite-(Ce)

Formula
Ce2Fe²⁺Be2Si2O10