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.:10
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| a chattering or flighty, light-headed person. |
| a scrap or morsel of food left at a meal. |