sedimentary

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

AI-generated identification · may be incorrect

Hardness: 1-3 Mohs; Color: reddish-brown, white, tan, or yellow; Luster: dull to earthy; Texture: pisolitic (pea-like) or massive; Specific Gravity: 2.0-2.5

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

Identified June 24, 2026More sedimentary →

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Physical properties

Hardness: 1-3 Mohs; Color: reddish-brown, white, tan, or yellow; Luster: dull to earthy; Texture: pisolitic (pea-like) or massive; Specific Gravity: 2.0-2.5

Formation & geological history

Formed through the intense chemical weathering (lateralization) of rocks in hot, humid tropical or subtropical climates. The coordinates provided (Visakhapatnam, India region) are known for significant bauxite deposits in the Eastern Ghats belt.

Uses & applications

Primary ore of aluminum; used in the production of alumina, abrasives, refractories, and chemicals.

Geological facts

Bauxite is not a mineral but a rock composed mainly of aluminum oxide minerals. First discovered in 1821 by Pierre Berthier near the village of Les Baux in France.

Field identification & locations

Identify by its earthy appearance and lack of distinct crystal structure. In the field, look for reddish-brown, clay-like masses often found as a cap over silicate rocks in tropical areas.