sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH), AlOOH)
AI-generated identification · may be incorrectHardness: 1-3 (very soft), Color: Reddish-brown, white, or gray, Luster: Dull/Earthly, Structure: Massive or pisolitic (pea-sized grains), 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 (very soft), Color: Reddish-brown, white, or gray, Luster: Dull/Earthly, Structure: Massive or pisolitic (pea-sized grains), Specific Gravity: 2.0-2.5
Formation & geological history
Formed by the intense chemical weathering of rocks in tropical or subtropical climates, a process known as lateritization. It is the primary ore for aluminum.
Uses & applications
Primary source of aluminum metal; used in abrasives, refractories, and chemicals such as alum and aluminum sulfate.
Geological facts
Named after the village Les Baux in southern France where it was first discovered in 1821. It is not technically a mineral but a rock composed mainly of aluminum oxide minerals.
Field identification & locations
Identified by its dull, earthy appearance and round, pea-like 'pisolitic' structures. Commonly found in tropical regions like Australia, Guinea, and Brazil.
More like this
Other sedimentary specimens
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary