Various minerals are employed in the manufacture of alum, the most important being alunite or alum-stone, alum schist, bauxite and cryolite. [Please select]
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Enough potash, however, is obtained in the United States for munition purposes from the burning of seaweed on the Pacific Coast, from the brines in a lake in Southern California and from a rock called alunite in Utah. [Please select]
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