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alum shale - Meaning and Examples

Meaning of 'alum shale' (Webster Dictionary)

1 . Alum shale
- 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.

Nearby Words:

aludel alula alular alum alum root alum schist alum stone alumen alumina aluminate

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