sedimentary
Bauxite
Aluminium ore consisting largely of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH)
AI-generated identification · may be incorrectHardness 1-3 (Mohs), dull to earthy luster, reddish-brown, white, or tan color, often pisolitic structure, specific gravity 2.0-2.5
Identified More sedimentary →
Explore Bauxite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness 1-3 (Mohs), dull to earthy luster, reddish-brown, white, or tan color, often pisolitic structure, specific gravity 2.0-2.5
Formation & geological history
Formed by lateritic weathering of aluminium-bearing rocks in tropical or subtropical climates
Uses & applications
Primary ore of aluminium used to produce alumina and then aluminium metal
Geological facts
Bauxite is named after the village of Les Baux in southern France, where it was first discovered in 1821.
Field identification & locations
Identified by its relatively low density, earthy appearance, and common pisolitic (pea-like) structure. Found mainly in tropical and subtropical regions such as Australia, Guinea, and Brazil.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary