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Astrophyllite Locality: Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia (Locality at mindat.org) Size: 6.9 x 6.2 x 1.9 cm. A particularly fine specimen from this important locality with thick, metallic-foil-like, flat-laying crystals to 3 cm embedded in matrix. Ex. Martin Zinn Collection. Mineral

Astrophyllite

astrophyllite

Formula
K2NaFe²⁺7Ti2Si8O28(OH)4F
Mohs
3
Atacamite, halloysite - La Farola Mine, Cerro Pintado, Las Pintadas Mining District, Tierra Amarilla, Copiapó Province, Atacama Region, Chile Mineral

Atacamite

atacamite

Formula
Cu2Cl(OH)3
Atelestite Field of view: 1 mm Locality: Schmiedestollen, Wittichen, Schenkenzell, Rottweil, Region Freiburg, Baden-Württemberg, Germany Mineral

Atelestite

atelestite

Formula
Bi2(AsO4)O(OH)
Mineral

Atelisite-(Y)

atelisite-(Y)

Formula
Y4Si3O8(OH)8
Atencioite Locality: Linópolis, Divino das Laranjeiras, Doce valley, Minas Gerais, Southeast Region, Brazil (Locality at mindat.org) A nice specimen of brown Atencioite. Field of view 7 mm. Specimen and photo Leon Hupperichs. Mineral

Atencioite

atencioite

Formula
Ca2Fe²⁺3Mg2Be4(PO4)6(OH)4 * 6H2O
Metallic crystal aggregates of the rare Cu-selenide mineral athabascaite from Sierra de Umango, Villa Castelli, General Lamadrid Department, La Rioja, Argentina. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Athabascaite

athabascaite

Formula
Cu5Se4
Mohs
2.5
A selection of backscatter electron (BSE) images showing PGMs and Au association. (a) An Au-rich (46.65 wt%) potarite; (b,c) Mertieite-I (M-I; Pd11(Sb,As)4) partly encapsulated in gold; (d) Isomertieite (IsM; Pd11Sb2As2) as an inclusion in a gold particle; (e) A vincentite (Vin; (Pd,Pt)3(As,Sb,Te)) attached to a gold grain; (f) Vysotskite (Vys; (Pd,Ni)S) enclosed by a gold aggregate; (g) An atheneite (Atn; (Pd,Hg)3As) attached to a gold grain with silicate inclusions; (h) Platinum (Pt) inclusion in a gold grain; and (i) Gold precipitation/nucleation on the surface of a sperrylite (Sp; PtAs2). The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. Mineral

Atheneite

atheneite

Formula
Pd2As0.75Hg0.25
Mohs
5
Mineral

Atlasovite

atlasovite

Formula
K(BiO)Cu6Fe³⁺(SO4)5O3Cl
Cubic crystal of the extremely rare palladium-tin mineral atokite (Pd3Sn) associated to isoferroplatinum from Komsomolski District, Khabarovsk Krai, Russian Federation. Analyzed specimen. Mineral

Atokite

atokite

Formula
Pd3Sn
Mohs
4.5
Mineral

Attakolite

attakolite

Formula
(Ca,Sr)Mn(Al,Fe)4(HPO4,PO4)3(SiO4,PO4)(OH)4
Attikaite Locality: Christiana Mine, Kamariza Mines (Kamareza Mines), Agios Konstantinos [St Constantine] (Kamariza), Lavrion District Mines, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece (Locality at mindat.org) Field of view 5 mm. Specimen and photo Leon Hupperichs. Mineral

Attikaite

attikaite

Formula
Ca3Cu2Al2(AsO4)4(OH)4·2H2O
Greenish blue crystals of the very rare sulphate aubertite from the type locality in Queténa (Queténa Mine, Chuquicamata, El Loa Province, Antofagasta Region, Chile). Mineral

Aubertite

aubertite

Formula
Cu²⁺Al(SO4)2Cl·14H2O
Mineral

Auerbakhite

auerbakhite
Augelite Locality: Ortega Prospect, Northern Ancash Dept., Peru Size: thumbnail, 3 x 3 x 2.8 cm Augelite A large crystal of augelite, measuring 2 cm across, stands out in this cluster. It is small overall but, for overall quality, absolutely TOPS and one of my favorites in the whole lot here! it is finely crysatllized all around. Mineral

Augelite

augelite

Formula
Al2PO4(OH)3
Mountainside augite inclusion location in Tillamook Mountains Oregon. Mineral

Augite

augite

Formula
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O
Auriacusite Field of view: 0.4 mm Locality: Maria Josefa Mine, Rodalquilar, Almería, Andalusia, Spain Mineral

Auriacusite

auriacusite

Formula
Fe³⁺Cu²⁺(AsO4)O
Aurichalcite with hemimorphite - 79 Mine, Chilito, Hayden area, Banner District, Gila County, Arizona, USA (7x6cm) Mineral

Aurichalcite

aurichalcite

Formula
(Zn,Cu²⁺)5(CO3)2(OH)6
Mohs
2
Auricupride Locality: Zolotaya Gora (Zlataya Gora; Zlatoya Gora) Au deposit, Soimon Valley, Karabash (Karabasch), Chelyabinsk Oblast', Southern Urals, Urals Region, Russia (Locality at mindat.org) Size: 1.7 x 1.3 x 0.7 cm. Auricupride is an ULTRA-RARE copper and gold alloy. This thumbnail features several clusters of rich, coppery-gold auricupride microcrystals on matrix from the Type Locality - Zolotaya Gora in the Urals. Rarely available. Ex. Fersman Museum of Moscow specimen. Mineral

Auricupride

auricupride

Formula
AuCu3
A lot of very small silvery nuggets of the extremely rare intermetallic Au-Hg mineral aurihydrargyrumite (IMA 2017-003) intermixed with other grains of arsenopyrite in a sample that was completely analyzed by SEM/EDS. From Modderfontein Mine, Benoni, Ekurhuleni District, Gauteng Province, South Africa. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Aurihydrargyrumite

aurihydrargyrumite

Formula
Au6Hg5
Mohs
2.5
Mineral

Aurivilliusite

aurivilliusite

Formula
Hg⁺Hg²⁺OI
Auropearceite (Aupea), gold (Au), acantite (Aca) Field of view: 210 μm Locality: Šibeničný vrch, Nová Baňa, Žarnovica District, Banská Bystrica Region, Slovakia Description: Anhedral grain of auropearceite (Aupea) rimmed by porous acanthite (Aca) and gold (Au). Holotype sample. BSE image by Tomáš Mikuš on JEOL JXA 8530F electron microprobe Mineral

Auropearceite

auropearceite

Formula
[Ag9AuS4][Ag6As2S7]
Mineral

Auropolybasite

auropolybasite

Formula
[Ag9AuS4][Ag6Sb2S7]
These mineral images are free to use how you wish. Mineral

Aurorite

aurorite

Formula
Mn²⁺Mn⁴⁺3O7·3H2O
Mineral

Auroselenide

auroselenide

Formula
AuSe