Alum shale (also known as alum schist and alum slate) is a variety of shale or clay slate (oil shale) containing pyrites. Decomposition of pyrite by weathering forms sulfuric acid, which acts on potash and alumina constituents to form alum, often efflorescences on the rock.
Alum shale contains kerogen originated from algae. At the same time it is rich of aromatic moieties attributed to post-depositional irradiation damage induced by uranium concentration in the shale. Between 1950 and 1989, Sweden used alum shale for the uranium production. Alum shale also contains enhanced levels of radium.
|Pterosaurs of the Alum Shale|
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