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- A clay consisting of a mixture of bauxitic minerals, such as gibbsite and diaspore, with clay minerals, the former constituting not over 50% of the total. The opposite of this would be an argillaceous bauxite. ACSB, 1
- A natural mixture of bauxite and clay, containing not less than 47% nor more than 65% alumina on a calcined basis. Harbison-Walker
Source: Dictionary of Mining, Mineral, and Related Terms
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