See Also: alum shale(medicine)
Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
shale(dictionary)
shale oil(encyclopedia)
shale(encyclopedia)
Shale(medicine)
oil shale(encyclopedia)
shale(2)(dictionary)
shale(1)(dictionary)
Burgess Shale(encyclopedia)

alum shale (medicine)


alum shale
<chemical> 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.

Source: Websters Dictionary