Mineral Specimen Images (A)

Artinite: Mg2(CO3)(OH)2·3(H2O)

Comments: Bright, white acicular sprays of artinite crystals on matrix.
Location: New Idria district, San Benito County, California, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Artinite: Mg2(CO3)(OH)2·3(H2O)

Comments: White, acicular clusters of artinite on matrix.
Location: San Benito County, California, USA. Scale: Cluster size 1.3 cm.
© Sandro Maggia/Minernet.it

Artsmithite: Hg+4Al(PO4)1.74(OH)1.78

Comments: White to tan, radial, acicular crystals of artsmithite on matrix.
Location: Funderburk Prospect, Pike County, Arkansas, USA. Scale: Picture size 0.7 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Artsmithite: Hg+4Al(PO4)1.74(OH)1.78

Comments: White or faint green platy micro crystals of artsmithite on matrix.
Location: Funderburk prospect, Pike County, Arkansas, USA. Scale: Crystal size 0.5 mm.
© Tom Loomis / Dakota Matrix

Arzakite: Hg3S2(Br,Cl)2

Comments: Orange brown arzakite crystals lining vug, co-type material; associated with jarosite (sharp crystals), montroydite (dark red - blackish).
Location: Arzak deposit, Tuva, Siberia, Russia. Scale: See Image.
© Rruff Database

Asbecasite: Ca3(Ti,Sn)As+++6Si2Be2O20

Comments: Brownish yellow asbecasite prismatic crystal.
Location: Cervandone, Val d'Ossola, Lombardy, Italy. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Asbolane: (Co,Ni)1-y(Mn++++O2)2-x(OH)2-2y+2x·n(H2O)

Comments: Brownish red dull grains of asbolane to 2mm in matrix.
Location: Lipovka, Middla Urals, Russia. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Aschamalmite: Pb6Bi2S9

Comments: Black metallic blades of aschamalmite associated with beige rhombic siderite.
Location: Costabella, Osiglia, SV, Italy. Scale: Crystal Size: 1 mm.
© Carlo Guidarin

Aschamalmite: Pb6Bi2S9

Comments: Lead gray metallic prismatic aschamalmite crystals in veins in quartz.
Location: Ascham Alp, Untersulzbach Valley, Salzburg, Austria. Scale: See Image.
© Rruff Database

Ashburtonite: HPb4Cu++4Si4O12(HCO3)4(OH)4Cl

Comments: Blue-green crystalline crust of ashburtonite on matrix.
Location: Anticline Deposit, Ashburton Downs, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Asisite: Pb12(SiO4)O8Cl4

Comments: Orange brownish asisite on matrix.
Location: Kombat Mine, Kombat, Namibia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Aspidolite: NaMg3AlSi3O10(OH)2

Comments: B&W thin section (PPL) of a clinopyroxene leuconorite showing Na-rich phlogopite surrounding corroded plagioclase (Pl). (AmMin, v86:29).
Location: Gabbroic crustal zenoliths form Volcan San Pedro, Chilean Andes. Scale: See Image.
© American Mineralogist

Asselbornite: (Pb,Ba)(UO2)6(BiO)4(AsO4)2(OH)12·3(H2O)

Comments: Small orange cubes of asselbornite on yellow uranophane.
Location: Weißer Hirsch Mine, Schneeberg, Erzgebirge, Sachsen, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Astrocyanite-(Ce): Cu2(Ce,Nd,La)2(UO2)(CO3)5(OH)2·1.5(H2O)

Comments: Blue-green bladed astrocyanite-(Ce) crystals on black uraninite ore. Schumacher Collection.
Location: Kamoto East Open cut, Kamoto, Kolwezi, Western area, Shaba Cu belt, Shaba (Katanga), Congo (Zaïre). Scale: Picture size 2 cm.
© Paul M. Schumacher

Astrophyllite: K2Na(Fe++,Mn)7Ti2Si8O26(OH)4

Comments: Dark brown acicular masses of astrophyllite in calcite matrix.
Location: Khibini, Kola Peninsula, Russia. Scale: 11 x 9 cm.
© Fabre Minerals

Atacamite: Cu2Cl(OH)3

Comments: Atacamite in a well crystallized pocket.
Location: Mina Lily, Pisco Umay, Ica Dept. Peru. Scale: 5 x 4.5 cm.
© Fabre Minerals

Atacamite: Cu2Cl(OH)3  
Santarosaite: CuB2O4

Comments: Encrustations of santarosaite (Cotype Specimen, MD212; blue) with atacamite (green) and anhydrite (white) on matrix. Discovered by Arturo Molina, Iquique, Chile in 2003. Holotype, sample MD 87, largely used up for the examinations.
Location: Santa Rosa Mine, Iquique, Chile. Scale: Sample Width 3 cm.
© K.C. Lyncker, Hamburg / German Type Specimen Catalogue

Atelestite: Bi8(AsO4)3(OH)5O5

Comments: Double-terminated crystal of atelestite.
Location: Junge Kalbe Mine, Neustfdtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size: 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Atencioite: Ca2Fe++[ ]Mg2Fe++2Be4(PO4)6(OH)4·6H2O

Comments: Nodule of tan atenciote.
Location: Pomaroli Mine, Linópolis,Minas Gerais, Brazil. Scale: Specimen size 1 cm.
© Adam Larson

Athabascaite: Cu5Se4  
Umangite: Cu3Se2  
Berzelianite: Cu2Se

Comments: Reflected light photomicrograph of umangite (pinkish), berzelianite (gray), athabascaite (small white areas in berzelianite), calcite (olive).
Location: Sierra de Umango, La Rioja, Argentin. Scale: Not Given.
© Jeff Weissman / Photographic Guide to Mineral Species