sedimentary
Bauxite
Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)
Hardness varies from 1 to 3 on the Mohs scale, color ranges from reddish-brown, pink, white, to yellowish-brown, dull or earthy luster, amorphous or pisolitic structure, no distinct cleavage, specific gravity ranges from 2.0 to 2.5.
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Physical properties
Hardness varies from 1 to 3 on the Mohs scale, color ranges from reddish-brown, pink, white, to yellowish-brown, dull or earthy luster, amorphous or pisolitic structure, no distinct cleavage, specific gravity ranges from 2.0 to 2.5.
Formation & geological history
Formed through the weathering of various silicate rocks in tropical or subtropical climates, typically through intense leaching of silica and other soluble components over millions of years.
Uses & applications
Primary ore used for the industrial production of aluminum metal and widely utilized in refractory materials, chemicals, and abrasives.
Geological facts
Bauxite is not a single mineral but a mixture of hydrous aluminum oxides, aluminum hydroxides, and clay minerals, often containing significant iron oxides which give it its characteristic rusty red color.
Field identification & locations
Can be identified in the field by its characteristic reddish-brown earthy appearance, pisolitic or clay-like texture, and softness. Commonly found in tropical and subtropical regions such as Australia, Guinea, Jamaica, and Brazil.
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