Abstract
The oxidation of pyrrhotite and pyrite initiates a series of weathering reactions in aggregates extracted from the Mont Palau quarry (Barcelona, Spain). The lithotypes enclosing the sulfides, however, play an important role in controlling the progress of weathering: whilst expansive hydrated Fe-sulfates characteristic of acidic environments formed in the black shales, the neutralizing capacity of calcite dissolution prevents the formation of these harmful mineral phases in the limestones.
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