sedimentary
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
Hardness: 1-3 Mohs; Color: reddish-brown, tan, or gray; Luster: earthy/dull; Structure: Pisolitic (pea-like) or earthy mass; Specific gravity: 2.0-2.5
- Hardness
- 1-3 Mohs
- Color
- reddish-brown, tan, or gray
- Luster
- earthy/dull
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Physical properties
Hardness: 1-3 Mohs; Color: reddish-brown, tan, or gray; Luster: earthy/dull; Structure: Pisolitic (pea-like) or earthy mass; Specific gravity: 2.0-2.5
Formation & geological history
Formed as a residual soil (laterite) through the intense chemical weathering of rocks in tropical or subtropical climates over millions of years.
Uses & applications
The primary ore of aluminum used in the production of aluminum metal, chemicals, and abrasives.
Geological facts
Bauxite is not a single mineral but a mixture of minerals like gibbsite, boehmite, and diaspore, along with iron oxides that give it its red color.
Field identification & locations
Identify by its distinctive earthy, clay-like appearance and often 'pea-shaped' round grains (pisoliths). Found in huge deposits in Australia, Guinea, and Brazil.
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