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Minerals

6323 results

Francevillite with Curienite Locality : Mounana Mine, Franceville, Haut-Ogooué, Gabon - Toptype deposit Size : 23 x 17 cm Size of crystal 0.8cm Mineral

Francevillite

francevillite

Formula
Ba(UO2)2(VO4)2·5H2O
Mohs
3
Dark red crystals of franciscanite associated to almost black nabiasite from Gambatesa mine in Valgraveglia, Italy. Ex. Erich Laskowski collection (USA). Mineral

Franciscanite

franciscanite

Formula
Mn²⁺6(V5+,☐)2(SiO4)2(O,OH)6
Francisite Locality: Iron Monarch open cut, Iron Knob, Middleback Range, Eyre peninsula, South Australia, Australia (Locality at mindat.org) Rare Francisite from the TL. Field of view 3 mm. Specimen and photo Leon Hupperichs. My thanks to Volker Hoppe for this exchange specimen. Mineral

Francisite

francisite
Franckeite Locality: San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia (Locality at mindat.org) Size: 3.3 x 2.5 x 1.5 cm. This specimen is a very rich, incredibly rare, superb quality, crystallized specimen of the triclinic lead, tin, iron, antimony sulfosalt Franckeite consisting of somewhat "sword"-shaped crystals oriented into spherical aggregates forming the shape of a flower. Mineral

Franckeite

franckeite

Formula
Fe(Pb,Sn)6Sn2Sb2S14
Beige crystal group of the extremely rare phosphate mineral francoanellite from the TL In Italy (Grotta di Castellana, Bari, Apulia, Italy). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Francoanellite

francoanellite
White aggregates of franconite on a single sharp weloganite crystal, from the type locality Francon (Francon Quarry, Québec, Canada). Franconite is a niobium mineral found in a very few localities worldwide. Mineral

Franconite

franconite

Formula
Na2Nb2O5(OH)·9H2O
A sample of charoitite with frankamenite (Murun Massif, Aldan Shield, Siberia, Russia). The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Frankamenite

frankamenite

Formula
K3Na3Ca5(Si12O30)(F,OH)4·H2O
Mineral

Frankdicksonite

frankdicksonite

Formula
BaF2
Mohs
3
Mineral

Frankhawthorneite

frankhawthorneite

Formula
Cu2Te⁶⁺O4(OH)2
Mineral

Franklinfurnaceite

franklinfurnaceite

Formula
Ca2Fe³⁺Mn²⁺3Mn³⁺(Zn2Si2O10)(OH)8
Franklinite (black) with Zincite (red) - Locality: Franklin, New Jersey, USA - Exposed in the Mineralogical Museum, Bonn, Germany Mineral

Franklinite

franklinite

Formula
ZnFe³⁺2O4
Mineral

Franklinphilite

franklinphilite

Formula
(K,Na)4(Mn²⁺,Mg,Zn)48(Si,Al)72(O,OH)216·6H2O
A microscopic view of blue franksousaite enclosed in a large colourless anglesite crystal, making the whole anglesite crystal look blueish. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Mineral

Franksousaite

franksousaite

Formula
PbCu(Se⁶⁺O4)(OH)2
Fransoletite Locality: Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer County, South Dakota, USA (Locality at mindat.org) Picture width 3 mm. Collection and photograph Christian Rewitzer Mineral

Fransoletite

fransoletite
White hexagonal crystals of the very rare franzinite from the type locality (Casa Collina Old Quarry, Pitigliano, Grosseto, Tuscany, Italy) and one of the few localities known worldwide. Sharp franzinite crystals are a very sought after mineral. Mineral

Franzinite

franzinite

Formula
(Na,K)6Ca2(Al6Si6O24)(SO4)2·2H2O
0,1 mm yellow needles of Françoisit-(Ce) from La Creusaz U prospect, Les Marécottes, Canton of Valais, Switzerland Mineral

Françoisite-(Ce)

françoisite-(Ce)

Formula
Ce(UO2)3O(OH)(PO4)2·6H2O
Mohs
3
Mineral

Françoisite-(Nd)

françoisite-(Nd)
Mineral

Freboldite

freboldite

Formula
CoSe
Dark brown prismatic crystals of the very rare Mg-Mn mineral fredrikssonite from Langban (Sweden), the type and only one of two known localities worldwide. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Fredrikssonite

fredrikssonite

Formula
Mg2Mn³⁺O2(BO3)
Mohs
6
Very small greenish yellow crystal group of the very rare mineral freedite from the famous Tsumeb mine in an specimen. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Freedite

freedite

Formula
Cu⁺Pb8(AsO3)2O3Cl5
Freieslebenite Locality: Neue Hoffnung Gottes Mine, Bräunsdorf, Freiberg District, Erzgebirge, Saxony, Germany (Locality at mindat.org) Size: 5.6 x 4.4 x 1.9 cm. This beautiful little specimen features extremely sharp twinned Freieslebenite crystals to 4mm (as a cluster), perched on crystallized quartz matrix. It was once in the Museum of Bonn in Germany, and their label notes that they obtained it from the famous German dealers August Krantz (1809-1872) and his son, who lived in Bonn from 1850 on. Mineral

Freieslebenite

freieslebenite

Formula
AgPbSbS3
Violet flakes of freitalite on sulfur from the mine dump of the Königin Carola shaft, Freital, near Dresden, Saxony, Germany. Picture width is 9 cm. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Freitalite

freitalite
Fresnoite, Quartz Locality: Junnila mine, New Idria District, Diablo Range, San Benito County, California, USA (Locality at mindat.org) Size: 1.9 x 1.7 x 0.4 cm. Fresnoite is a rare barium, titanium silicate and this fine thumbnail is richly covered with lustrous, sharp, burnt-yellow, blocky, complex crystals to 6 mm perched on quartz matrix from a small find of this hard-to-get species. This is a particularly rich and showy specimen of this rare species from the 1998 find. Mineral

Fresnoite

fresnoite

Formula
Ba2Ti(Si2O7)O
Black microcrystals of the very rare mineral freudenbergite from one of the only five known localities worldwide. Associated mineral is orange-brown rutile. From: Kaskasnyunchorr, Khibiny Massif, Kola, Russian Federation. Mineral

Freudenbergite

freudenbergite