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Minerals, Volume 13, Issue 4

2023 April - 130 articles

Cover Story: The formation of thin mineral films floating on water surfaces in low-flow or stagnant zones of acid mine drainage (AMD) streams remains enigmatic. We investigated their structure, mineralogy, stability and metal-retention capacity in the Iberian Pyrite Belt (SW Spain). Fe(III) minerals (jarosite, schwertmannite and ferrihydrite) were the dominant phases, with mineralogy determined by pH. In addition, these films were highly enriched for trace metals. Fe(II)-oxidizing microorganisms (Ferrovum, Acidithiobacillus and Leptospirillum) were identified in waters underlying these films, indicating their importance in Fe(III) mineral film formation. These films represent hotspots of biosphere/hydrosphere/atmosphere interactions of great value for the study of iron biogeochemistry in redox boundaries. View this paper
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Minerals - ISSN 2075-163X
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