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Allophane: Al2O3·(SiO2)1.3-2·((H2O))2.5-3
Comments: Blue, cuprian, botryoidal allophane on matrix. Location: Reiche Zeche Mine, Himmelfahrt Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag