sedimentary

Bauxite

Bauxite (Al(OH)3, AlO(OH))

AI-generated identification · may be incorrect

Hardness: 1-3 Mohs; Color: reddish-brown, white, gray, or yellow; Luster: dull to earthy; Structure: Pisolitic (pea-shaped) or massive; Fracture: uneven; Opaque.

Hardness: 1-3 Mohs
Color: reddish-brown, white, gray, or yellow
Luster: dull to earthy

Identified April 11, 2026More sedimentary →

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Physical properties

Hardness: 1-3 Mohs; Color: reddish-brown, white, gray, or yellow; Luster: dull to earthy; Structure: Pisolitic (pea-shaped) or massive; Fracture: uneven; Opaque.

Formation & geological history

Formed as a residual mineral after the weathering of silicate rocks in tropical or subtropical climates, causing the leaching of silica and leaves behind enriched aluminum oxides. Primarily from the Cenozoic era.

Uses & applications

The primary ore for aluminum production. Used in refractories, abrasives, chemicals, and cement industries.

Geological facts

Bauxite is not a mineral in the strict sense but a mixture of hydrous aluminum oxides like gibbsite, boehmite, and diaspore. It is named after the village Les Baux in southern France where it was first discovered in 1821.

Field identification & locations

Identify by its distinctive 'pisolitic' (clumpy, pea-like) texture and lightweight feel compared to iron ores. Found in weathered tropical regions like Australia, Guinea, Brazil, and Jamaica.