Bible Dictionaries
Alum Shale
Webster's Dictionary
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.
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Bibliography Information
Webster, Noah. Entry for 'Alum Shale'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/alum-shale.html. 1828.