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Picture width 2.3 mm. Collection and photograph Christian Rewitzer. PXRD confirmed. From Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta Region, Chile. Mineral

Antlerite

antlerite

Formula
Cu²⁺3SO4(OH)4
Outsanding tabular colorless crystals of the extremely rare antofagastaite (IMA 2018-049) from the type locality in Chile (Coronel Manuel Rodríguez Mine, Mejillones Peninsula, Antofagasta Province, Antofagasta Region, Chile) and only one of the two known localities worldwide. Associated mineral are yellow sideronatrite and blue green kröhnkite. Part of the holotype specimen. Mineral

Antofagastaite

antofagastaite

Formula
Na2Ca(SO4)2·1.5H2O
Mineral

Anyuiite

anyuiite

Formula
AuPb2
Mineral

Anzaite-(Ce)

anzaite-(Ce)

Formula
Ce4Fe²⁺Ti6O18(OH)2
Mineral

Apachite

apachite

Formula
Cu9Si10O29·11H2O
White apexite crystals (IMA 2015-002) associated to yellow cejkaite from the type locality for apexite in Apex mine (Reese River, Lander County, Nevada, United States of America). Mineral

Apexite

apexite

Formula
NaMg(PO4)·9H2O
Aphthitalite Locality: Ghom Salt Dome, Qom (Ghom) Province, Iran (Locality at mindat.org) Size: 6.1 x 5 x 3 cm. A very rare sulfate, that is apparently stable, and comes at a surprising quality level form these vast salt deposits in Iran. This piece has numerous crystals to over 1 cm. Ex. Martin Zinn Collection. Mineral

Aphthitalite

aphthitalite

Formula
K3Na(SO4)2
Mohs
3
Yellowish crystals of the rare manganese sulphate mineral ilesite in a matrix of white apjohnite from one of the few localities known worldwide for ilesite. From: Santa Ana Mine, Mazarron, Murcia, Spain. Mineral

Apjohnite

apjohnite

Formula
Mn²⁺Al2(SO4)4 * 22H2O
:Locality: Tunaberg, Södermanland, Sweden Size: 0.5 × 0.4 × 0.3 cm Description: Very nice faceted cobaltite crystal from this classic Swedish locality, but more interesting for the pinkish to reddish layer that covers all the specimen. We have analyzed by SEM-EDS and results show that aplowite is present and accompanied by reddish erythrite. Mineral

Aplowite

aplowite

Formula
Co(SO4)·4H2O
Sharp cubic black crystals of apuanite from the type and only known locality worldwide: Buca Della Vena Mine, Apuan Alps, Lucca Province, Tuscany, Italy. Mineral

Apuanite

apuanite

Formula
Fe²⁺Fe³⁺4Sb³⁺4O12S
Outstanding pink crystal aggregates of the very rare zirconium mineral aqualite from one of the only three known localities worldwide (Kovdor Phlogopite Mine, Kovdor Massif, Murmansk Oblast, Russian Federation). Ex. Erich Laskowski collection (USA). Mineral

Aqualite

aqualite

Formula
(H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl
(a) Polished sample with gehlenite–andradite–pseudowollastonite paralava in hornfels. Hornfels––the dark part represents weakly altered gehlenite–flamite rock, the light part altered hornfels in which flamite is replaced by silicocarnotite and Ca-hydroxides, and gehlenite by hydrogarnet. In the paralava, the minerals are coloured as follows: Ti-bearing andradite––dark brown, gehlenite––light brown, wollastonite, flamite and pseudowollastonite––white. (b) A polished thin-section from the central part of the sample is shown in Figure 1a. (c) Silicocarnotite forms single crystals and rims on fluorapatite crystals. A crystal of V-bearing silicocarnotite is marked in the lower part of the image. (d) U-bearing pseudowollastonite, vorlanite and aradite aggregate in a large pseudowollastonite grain. (e) Reaction zone of rankinite between flamite and pseudowollastonite. Ara = aradite, Adr = andradite, Fmt = flamite, Fap = fluorapatite HSi = Ca-hydrosilicate, Gh = gehlenite, Jcb = jacobsite, Pwo = pseudowollastonite, Rnk = rankinite, Scnt = silicocarnotite, Vrl = vorlanite. Mineral

Aradite

aradite

Formula
BaCa6[(SiO4)(VO4)](VO4)2F
Quartz, Aragonite Locality: Valle de las Plumas, Paso de Indios, Chubut, Argentina (Locality at mindat.org) Size: 7.8 x 6.8 x 5.0 cm. These sharp, large aragonite crystals have been pseudomorphed by quartz, included by hematite which gives it its reddish tone. So what you have is quartz in the exact form of the prior aragonite crystals, having preserved their form perfectly. This is a floater, in superb condition. Ex. Richard Hauck Collection. Mineral

Aragonite

aragonite

Formula
CaCO3
Mohs
3.75
Colour
colorless, pink, blue, yellow
Mineral

Arakiite

arakiite

Formula
ZnMn²⁺12Fe³⁺2(As³⁺O3)(As⁵⁺O4)2(OH)23
Aramayoite Locality: Animas Mine, Atocha-Quechisla District, Sud Chichas Province, Potosí Department, Bolivia (Locality at mindat.org) One of the rarest silver minerals that isn't just found in microscopic amounts in polished sections. Usually seen, when seen at all, in very small cleavages. This is an outstanding specimen from the original locality, with much of the specimen consisting of large thick xl plates of aramayoite. Specimens like this, likely found in the 1920s, rarely come on the market. It is, according to Mark, unprecedented in quality since the discovery of the mineral in 1926. It was an abberant crystal that turned up in an old collection purchased by Cal Graeber some years ago. True, it is a crude crystal that fades out at the base, but it has a decent termination and clear faces, and is of rather high import so a few blemishes can be forgiven in that regard. 2.3 x 1.5 x 1.2 cm Mineral

Aramayoite

aramayoite

Formula
Ag3Sb2(Bi,Sb)S6
Mohs
2.5
Mineral

Arangasite

arangasite

Formula
Al2(SO4)(PO4)F·9H2O
Mineral

Arapovite

arapovite
Mineral

Aravaipaite

aravaipaite

Formula
Pb3AlF9·H2O
Mineral

Aravaite

aravaite

Formula
Ba2Ca18(SiO4)6(PO4)3(CO3)F3O
Arcanite Close view. Mineral collection of Brigham Young University Department of Geology, Provo, Utah. Photograph by Andrew Silver. BYU index 10-7018. Mineral

Arcanite

arcanite

Formula
K2[SO4]
Mohs
2
Colour
white, yellow
Buff to tan colored almost brown biphosphammite crystals associated to white archerite from the type locality in Australia: Murra-el-elevyn Cave, Dundas Shire, Western Australia, Australia. Mineral

Archerite

archerite

Formula
H2KPO4
White glassy granular crystals of the extremely rare mineral arctite from the type locality and only know locality worldwide (Vuonnemiok River Valley, Kola, Russian Federation), and associated to pink villiaumite. Ex-Excalibur-Cureton Company specimen. Mineral

Arctite

arctite

Formula
Na5Ca7Ba(PO4)6F3
Mohs
5
Metallic grey single crystal of the extremely rare Ag-Cu-Bi mineral arcubisite from the type locality in Ivigtut (Ivigtut, Ivittuut, Arsuk Fjord, Sermersooq, Greenland). Ex.Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Arcubisite

arcubisite

Formula
Ag6CuBiS4
Ardaite in Galena, Madjarovo ore deposit Mineral

Ardaite

ardaite

Formula
Pb17Sb15S35Cl9