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Clairite: (NH4)2Fe+++3(SO4)4(OH)3·3(H2O) Rostite: AlSO4(OH,F)·5(H2O)
Comments: Brownish crystals of clairite on white massive rostite. Location: Anna Mine, Alsdorf, Aachen, North Rhine-Westphalia, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag