alum schist

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.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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