Aluminium is manufactured from _____. 

The correct answer is Bauxite ore.

Key Points

• Bauxite rock is largely composed of a mixture of hydrous aluminum oxide.
• Bauxite is the main ore of aluminium.
• Bauxites vary physically according to the origin and geologic history of their deposits, with some deposits being soft, easily crushable, and structureless.

Additional Information

• Bauxite is formed by intensive weathering of many different rocks.
• Clay minerals usually represent intermediate stages, but some bauxites appear to be reworked chemical precipitates rather than simple alteration products.
• The constituent minerals are rarely identified in direct samples and even in thin sections, their complete identification can be difficult.
• It has been determined through integrated petrography, X-ray diffraction, and differential thermal analysis that gibbsite, boehmite, and diaspor are individual or mixed components in the minerals.
• Bauxite is found in most countries, but the larger deposits occur in the tropics.
• Major deposits of gravel mixed with sand were discovered in Australia in the 1950s, and it became the world’s top producer of bauxite by the early 21st century.