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