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Bible Dictionaries
Alum Shale

Webster's Dictionary

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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.

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.
 
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