Mineral Specimen Images (A)

Armbrusterite: K5Na6Mn+++Mn++14[Si9O22]4(OH)10·4H2O

Comments: Translucent yellow-brown crystals of armbrusterite on small fragment of brown matrix.
Location: Kirovskii Mine, Mt. Kukisvumchorr, Khibiny, Kola Peninsula, Russia. Scale: Specimen Size 5x3x2 mm.
© John Betts - Fine Minerals

Armenite: BaCa2Al6Si9O30·2(H2O)

Comments: Translucent, white armenite crystals.
Location: Simplon Pass, Brig, Valais, Switzerland. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Armstrongite: CaZrSi6O15·3(H2O)

Comments: Tan massive armstrongite aggregate in granite.
Location: Khan-Bogdo Massif, Gobi, Mongolia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Arrojadite: KNa4CaMn++4Fe++10Al(PO4)12(OH,F)2

Comments: Brownish to clear crystals of arrojadite on matrix.
Location: Big Fish river area, Yukon Territory, Canada. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Arrojadite: KNa4CaMn++4Fe++10Al(PO4)12(OH,F)2

Comments: Tabular, diamond shaped golden yellow crystal of arrojadite.
Location: Rapid Creek, Yukon, Canada. Scale: Crystal to 5mm..
© Tom Loomis / Dakota Matrix

Arrojadite-(BaFe): (Ba,K,Pb)Na3(Ca,Sr)(Fe++,Mg,Mn)14Al(PO4)11(PO3OH)(OH,F)2

Comments: Small grain of Arrojadite-(BaFe).
Location: Big Fish River, Yukon, Canada. Scale: Not Given.
© Sergey Vasiliev / Systematic Mineralogy

Arrojadite-(KFe): KNa2CaNa2(Fe++,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2

Comments: Greenish Gray, massive arrojadite-(KFe).
Location: Nickel Plate mine, Keystone District, Pennington County, South Dakota, USA. Scale: See Image.
© Rruff Database

Arrojadite-(KNa): KNa4Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2

Comments: Brownish crystals of arrojadite-(KNa).
Location: Big Fish River, Dawson Mining District, Yukon Territory, Canada. Scale: Picture Size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Arrojadite-(NaFe): NaNa2CaNa2(Fe++,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2

Comments: Dark bluish gray radial crystals of arrojadite-(NaFe).
Location: Boundary Creek, Richardson Mountains, Dawson mining district, Yukon Territory, Canada. Scale: See Image.
© Rruff Database

Arsenbrackebuschite: Pb2(Fe++,Zn)(AsO4)2·(H2O)

Comments: Brownish yellow arsenbrakenbuschite crystals on matrix.
Location: Tsumeb, Namibia.. Scale: Not Given.
© William Pinch

Arsendescloizite: PbZn(AsO4)(OH)

Comments: Spherical aggregates of arsendescloizite crystals.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Arsenic: As

Comments: Bright, metallic, gray, crystalline aggregate or arsenic.
Location: Niederschlema, Saxony, Germany. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Arsenic: As

Comments: Botryoidal-concentric aggregate of arsenic with white calcite crystals.
Location: Schneeberg, Erzgebirge, Sachsen, Germany. Scale: 7 x 4 cm.
© Thomas Witzke / Abraxas-Verlag

Arsenic: As  
Claudetite: As2O3

Comments: Colorless prismatic crystal of claudetite on native arsenic.
Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Arseniopleite: (Ca,Na)(Na,Pb)Mn++(Mn++,Mg,Fe++)2(AsO4)3

Comments: Massive, orange arseniopleite.
Location: Sjögruvan, Grythyttan, Örebro, Sweden. Scale: Not Given.
© Tom Loomis / Dakota Matrix

Arseniosiderite: Ca2Fe+++3(AsO4)3O2·3(H2O)

Comments: Yellowish brown, roughly spherical aggregates of arseniosiderite crystals on matrix.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Arseniosiderite: Ca2Fe+++3(AsO4)3O2·3(H2O)  
Cobaltarthurite: CoFe+++2(AsO4)2(OH)2·4(H2O)

Comments: Olive-greenish crystalline druse of cobaltarthurite with spherical arseniosiderite.
Location: Pastrana, Mazarrón, Murcia, Spain. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Arsenocrandallite: (Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O)

Comments: Micro, pale blue botryoids of arsenocrandallite on dark green olivenite and quartz.
Location: Centennial Eureka Mine, Juab County, Utah. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Arsenoflorencite-(Ce): (Ce,La)Al3(AsO4)2(OH)6

Comments: SEM image of euhedral crystal of arsenoflorencite-(Ce). (MinMag, v51:605).
Location: Stream-sediment sample taken on the Kimba 1:250000 mapsheet on the Eyre Peninsula in South Australia. Scale: See Image.
© Mineralogical Magazine

Arsenoflorencite-(La): (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6

Comments: BSE image of four grains of orange-red Arsenoflorencite-(La) from heavy concentrates of gold-bearing sedimentary rocks.
Location: Grubependity Lake, Maldinskii Region, Prepolar Ural, Russia. Scale: See Image.
© Diederik Visser