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Bauxite is a sedimentary rock with a relatively high aluminium content. It is the world’s main source of aluminium and gallium. Bauxite consists mostly of the aluminium minerals gibbsite , boehmite and diaspore , mixed with the two iron oxides goethite and hematite , the aluminium clay mineral kaolinite and small amounts of anatase and ilmenite .
Numerous classification schemes have been proposed for bauxite.
Vadász (1951) distinguished lateritic bauxites (silicate) from karst bauxite ores (carbonate):
- The carbonate bauxites occur predominantly in Europe, Guyana, and Jamaica above carbonate rocks (limestone and dolomite), where they were formed by lateritic weathering and residual accumulation of intercalated clay layers – dispersed clays which were concentrated as the enclosing limestones gradually dissolved during chemical weathering.
- The lateritic stones are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of this stones depends even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer. The aluminium hydroxide in the lateritic bauxite deposits is almost exclusively gibbsite.
In the case of Jamaica, recent analysis of the soils showed elevated levels of cadmium, suggesting that the bauxite originates from recent Miocene ash deposits from episodes of significant volcanism in Central America.
Australia is the largest producer of bauxite, followed by China. In 2017, China was the top producer of aluminium with almost half of the world’s production, followed by Russia, Canada, and India. Although aluminium demand is rapidly increasing, known reserves of its stones ore are sufficient to meet the worldwide demands for aluminium for many centuries. Increased aluminium recycling, which has the advantage of lowering the cost in electric power in producing aluminium, will considerably extend the world’s reserves.
Následující část je pseudově vědecká a založená na kulturním přesvědčení.
Bauxite stone can be used in meditation, and this may be helpful to help you to obtain answers to situations that may be concerning you
It may also allow you to be aware of the intentions of others. It is known to help to create an increase of feelings of happiness and heightened well being.
It does not work immediately but if it is kept in your vicinity, its energy works to stimulate you over time.
By assisting you to release emotional issues that are stopping you from achieving what you desire, it may help you to release feelings that are causing you to feel angry or resentful about the circumstances of your life.