a mixture, and rock, comprised of iron and aluminium hydroxides/oxides. The primary ore of aluminium.
photo credit: https://www.mindat.org/min-575.html
note: According to World Mining Data 2024, almost 400 Mt of bauxite was mined in 2022 for the production of close to 70 Mt of primary aluminum. Major source countries for bauxite are Guinea, Australia, China, Brazil and Indonesia, representing 86% of production. USGS reports 30 Gt (75 years) of reserves and 55-75 Gt of resources for bauxite.