Definition of Alum shale. Meaning of Alum shale. Synonyms of Alum shale
Here you will find one or more explanations in English for the word Alum shale.
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Definition of Alum shale
Alum shale Alum schist Al"um schist", Alum shale Al"um shale", (Min.)
A variety of shale or clay slate, containing iron pyrites,
the decomposition of which leads to the formation of alum,
which often effloresces on the rock.