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Arhbarite: Cu2Mg(AsO4)(OH)3
Comments: Deep blue, smooth, botryoidal aggregate of arhbarite in a 2mm vug associated with atacamite. Location: El Guanaco mine, Atacama, Tal Tal(?), Chile. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix
Aristarainite: Na2MgB12O20·8(H2O)
Comments: B&W image of aristarainite crystals freed from the enclosing borax/kernite (AmMin, v59:647). Location: Tincalayu mine, Salta, Argentina. Scale: See Image. © American Mineralogist
Armalcolite: (Mg,Fe++)Ti2O5
Comments: Gray semi-metallic armalcolite micro crystals on coal. Location: Chelyabinsk Oblast', Urals Region, Russia. Scale: See Image. © Rruff Database
Armangite: Mn26As+++18O50(OH)4(CO3)
Comments: Black crystals of armangite on matrix. Location: Langban, Varmland, Sweden.. Scale: Specimen Size 2.5 x 4 cm. © John Veevaert
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
Comments: SEM image of a spherulite of platy crystals of armbrusterite (2 mm diameter) on cancrinite and calcite. (AmMin, v92:416). Location: Khibiny massif, Kola Peninsula, Russia.. Scale: Spherulite Size 2 mm. © American Mineralogist
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
Comments: Tabular, diamond shaped golden yellow crystal of arrojadite. Location: Rapid Creek, Yukon, Canada. Scale: Crystal to 5mm.. © Tom Loomis / Dakota Matrix