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Bauxite
Industrial Material
Bauxite primarily refers to the raw material used in large-scale industrial applications, especially aluminum production. 
Geology Term
Bauxite is a term often used in geology, signifying its relevance in earth sciences and studies of the Earth's crust. 
Not a Gemstone
Unlike diamonds or emeralds, bauxite is not used in jewelry; it's valued for its industrial utility, not its beauty. 