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Alum Shale

A rock subtype
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An argillaceous sedimentary rock, often a variety of Black shale, containing pyrite or marcasite. Decomposition of the pyrite and marcasite by weathering forms sulfuric acid which reacts with aluminous minerals in the rock to form alum and other aluminum sulfates.
Synonym of: alum earth, alum schist, alum slate


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Mindat ID:
52092
Long-form identifier:
mindat:1:1:52092:6

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