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Aluminocopiapite: Al2/3Fe+++4(SO4)6O(OH)2·20(H2O)
Comments: Small yellow crystals of aluminocopiapite. Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Aluminum: Al
Comments: Native aluminum in a polished section. Location: From a mud volcano in the Caspian Sea near Baku, Azerbaidzhan. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Alumohydrocalcite: CaAl2(CO3)2(OH)4·3(H2O)
Comments: Pinkish-white globular aggregates of alumohydrocalcite. Location: Carriere de Richelle, Vise, Belgium. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Alumoklyuchevskite: K3Cu3AlO2(SO4)4
Comments: Very small olive-greenish prismatic crystals of alumoklyuchevskite. Location: Tolbachik volcano, Kamchatka, Russia. Scale: Sample size 1.8 x 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Alunogen: Al2(SO4)3·17(H2O) Jarosite: KFe+++3(SO4)2(OH)6
Comments: Colorless to white, tabular crystals alunogen on reddish jarosite. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Amblygonite: (Li,Na)Al(PO4)(F,OH)
Comments: Grayish, massive amblygonite from the type locality. Location: Chursdorf, Penig, Chemnitz, Saxony, Germany. Scale: Specimen size 35 mm. © Thomas Witzke / Abraxas-Verlag
Annite: KFe++3AlSi3O10(OH,F)2
Comments: Bottle-green manganoan annite fragment. Location: Thiemendorf, Königshain, Oberlausitz, Saxony, Germany. Scale: Picture size 2.5 mm. © Thomas Witzke / Abraxas-Verlag
Apuanite: Fe++Fe+++4Sb+++4O12S
Comments: Black tabular crystal of apuanite on matrix. Location: Buca della Vena Mine, Stazzema, Versilia Valley, Apuan Alps, Tuscany, Italy. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag
Aravaipaite: Pb3AlF9·(H2O)
Comments: Colorless thin tabular crystals of aravaipaite. Location: Grand Reef Mine, Aravaipa District, Graham County, Arizona, USA. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Argyrodite: Ag8GeS6
Comments: Gray, metallic, massive, crystalline argyrodite ore. Location: Himmelsfürst mine, Brand-Erbisdorf bei Freiberg, Erzgebirge, Sachsen. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag