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Minerals

6323 results

Mineral

Fluorstrophite

fluorstrophite

Formula
SrCaSr3(PO4)3F
Mineral

Fluorthalénite-(Y)

fluorthalénite-(Y)
Mineral

Fluorvesuvianite

fluorvesuvianite

Formula
Ca19(Al,Mg,Fe²⁺)13(Si2O7)4(SiO4)10O(F,OH)9
Mohs
6
Outstanding white crystals of the extremely rare new mineral fluorwavellite (IMA 2015-077), the fluorine analog of wavellite, known from only four localities worldwide. From: Willard Mine, Pershing County, Nevada, United States of America. Mineral

Fluorwavellite

fluorwavellite

Formula
Al3(PO4)2(OH)2F*5H2O
Orange crystals of the extremely rare mineral flurlite from the type and only known locality worldwide in Hagendorf South (Hagendorf South Pegmatite, Bavaria, Germany). Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Flurlite

flurlite

Formula
Zn3Mn²⁺Fe³⁺(PO4)3(OH)2·9H2O
Flörkeite from Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany. Field of view 3 mm. Mineral

Flörkeite

flörkeite

Formula
(K3Ca2Na)[Al8Si8O32]·12H2O
Foggite Locality: Palermo No. 1 Mine (Palermo No. 1 pegmatite; Hartford Mine; GE Mine), Groton, Grafton Co., New Hampshire, USA Dimensions: 2.6 cm x 1.8 cm x 1.3 cm A cool and rare representative specimen featuring orange-yellow groups of the calcium aluminum phosphate, foggite from Pod No. 3 of the Palermo No. 1 Mine. Foggite is named after Forrest F. Fogg, a mineral collector of Penacook, New Hampshire, who provided the first material. This mineral is only found in four world localities, and the most famous material is from the Palermo No. 1 Mine. This particular piece was mined in 1975. For reference, the label states that there is an unknown mineral on the piece as well. Mineral

Foggite

foggite
Well formed groups of pale yellow acicular crystals of the extremely rare fogoite-(Y) (IMA 2014-098) from the type and only known locality worldwide: Agua de Pau Volcano, San Miguel Island, Azores District, Portugal. Fogoite-(Y) is a Yttrium-Titanium silicate and it is the second new mineral from the locality after chiappinoite-(Y). Mineral

Fogoite-(Y)

fogoite-(Y)

Formula
Ca2Y2Na3Ti(Si2O7)2(OF)F2
tourmaline var. foitite, quartz, feldspar var. orthoclase : Pastori Vein (Filon dei Pastori), Fosso Marcianella Pegmatite, Catri, Sant’Ilario in Campo, Campo nell’Elba, Elba Island, Livorno Province, Tuscany, Italy Mineral

Foitite

foitite

Formula
(☐,Na)(Fe²⁺2Al)Al6(Si6O18)(BO3)3(OH)3OH
Mohs
7
Folvikite Locality: Kitteln Mine (TL), Filipstad, Värmland, Sweden Mineral

Folvikite

folvikite

Formula
Sb⁵⁺Mn³⁺(Mg,Mn²⁺)10O8(BO3)4
Mohs
6
Mineral

Fontanite

fontanite
Fontarnauita, trobada a la regió d’Anatòlia, a l’oest de Turquia Mineral

Fontarnauite

fontarnauite

Formula
(Na,K)2(Sr,Ca)(SO4)[B5O8(OH)]·2H2O
Olive brown single crystal group of the extremely rare Sn-Nb-Ta mineral foordite in a completely analyzed specimen by SEM/EDS, from Kubitaka, Punia, Maniema, DR Congo. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Foordite

foordite
Footemineite Locality: Foote Lithium County Mine (Foote Mine), Kings Mountain District, Cleveland County, North Carolina, USA (Locality at mindat.org) Brown crystals of Footemineite. Field of view 3 mm. Specimen and photo Leon Hupperichs. Mineral

Footemineite

footemineite

Formula
Ca2Mn²⁺5Be4(PO4)6(OH)4·6H2O
Crystals of the very rare yttrium tantalate mineral formanite-(Y) from the TL in Australia (Cooglegong Pegmatite, Shaw River, East Pilbara Shire, Western Australia, Australia). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Formanite-(Y)

formanite-(Y)

Formula
YTaO4
Really outstanding crystals of the very rare organic mineral formicaite from one of the very few known localities worldwide (Alkali Lake, Lake County, Oregon, United States of America). Naturally occurring calcium formate - one of just two such minerals currently known (compare dashkovaite). Ex. Erich Laskowski collection (USA). Mineral

Formicaite

formicaite

Formula
Ca(CHOO)2
Mohs
1
Fornacite Field of view: 0.4 mm Locality: Fernando Mine No. 1, Agrileza mines, Lophos, Lavrion mining district, Lavreotiki, East Attica, Attica, Greece (locality at mindat.org) Mineral

Fornacite

fornacite

Formula
CuPb2(CrO4)(AsO4)(OH)
Mohs
2.5
Forsterite - Not every thin tabular colorless crystal is sanidine. This is a thin Forsterite tabular (image width: 1.5 mm). Forsterite specimens are very typical with lots of tiny "broken" Sanidine and rounded Hematite crystals. - Locality: Wannenköpfe, Ochtendung, Eifel region, Germany Mineral

Forsterite

forsterite

Formula
Mg2SiO4
Mohs
7
Sky blue globular crystal aggregates of the extremely rare mineral foretite from the type locality in Cap Garonne (Cap Garonne Mine, Le Pradet, Var, Provence-Alpes-Cote d'Azur, France). It is a relatively new mineral (IMA 2011-100). Foretite has only been found in 2 localities worldwide. Mineral

Forêtite

forêtite
Foshagite Locality: Crestmore quarries, Crestmore, Riverside Co., California (Locality at mindat.org) A really rich specimen of solid material, composed of the rare silicate foshagite in lateral crystals grown parallel to each other. Al Ordway collected this in the early 1970s, himself. I have not seen such pieces for sale in my time, of this species, and it seems to be a good one for size and richness, compared to other examples I have found through MINDAT. TYPE LOCALITY 5.8 x 4.3 x 2.7 cm Mineral

Foshagite

foshagite

Formula
Ca4(Si3O9)(OH)2
Fougerite Field of view: 4 mm Locality: Concordia smelter, Eschweiler, Lower Saxony, Germany Mineral

Fougèrite

fougèrite
Fourmarierite, Becquerelite, Uraninite Locality: Shinkolobwe Mine (Kasolo Mine), Shinkolobwe, Central area, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre) (Locality at mindat.org) Size: 5 x 5 x 4 cm. A rich example of Uraninite covered with red hexagonal Fourmarierite crystals. The crystals are associated with good sized and well formed Becquerelite crystals. Shinkolobwe is the type locality for both of Fourmarierite and Becquerelite. Ex. Carnegie Museum Collection. Mineral

Fourmarierite

fourmarierite

Formula
Pb(UO2)4O3(OH)4·4H2O
A classic thumbnail specimen of the famous pieces of fowlerite (a zinc-bearing variety of rhodonite) from the Franklin Mine. It's important to note that fowlerite was at one time a valid species, mostly because fine crystals of rhodonite were almost completely unheard of prior to the discovery of the crystals from Franklin. Typically, fowlerite will have a slightly different color than the actual rhodonite crystals, with more of a brownish overtone as opposed to the saturated pink hue we're used to seeing from Franklin. This piece features a sharp, well-formed, 9 mm crystal of fowlerite sitting aesthetically on calcite matrix. The fowlerite crystal has a rough "contact termination" on the top, so it's not 100% complete, but it's still a very nice example of this hard to find classic material. The calcite shows a glowing red fluorescence under UV light. From the collection of Frank Keutsch. Mineral

Fowlerite

fowlerite
Fraipontite Locality: Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece (Locality at mindat.org) Size: thumbnail, 1.4 x 1.0 x 0.9 cm Fraipontite An old specimen in a micromount box which hosts several rich pockets of pearly white, sub-mm fraipontite crystals associated with green smithsonite. This is a rare zinc aluminosilicate species. Ex. John White Collection. Mineral

Fraipontite

fraipontite

Formula
(Zn,Al)3(Si,Al)2O5(OH)4