Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for Alum shale from the 1913 edition of Webster's Revised Unabridged Dictionary. Define Alum shale using one of the most comprehensive free online dictionaries on the web.

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Alum shale
Part of Speech: noun
Results: 1
1. 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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