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What is ore ? and give some examples also ?

An ore is any naturally-occurring source of a metal that can be extracted  economically  from a metal using various process.
Aluminium, for example, is the most common metal in the Earth's crust, occurring in all sorts of minerals.
Copper is much rarer, but fortunately can be found in high-grade ores (ones containing a high percentage of copper) in particular places. Because copper is a valuable metal, it is also worth extracting it from low-grade ores as well.

Ores are commonly oxides - for example:

bauxite    Al2O3
haematite    Fe2O3
rutile    TiO2
Ore- desired metal
Malachite: Copper
Azurite: Copper
Sandstone: Quartz
Bauxite: Aluminum
Banded Iron: Iron
Magnetite: Iron
Hematite: Iron
Stibnite: Antimony
Pyrite: Sulfur
Limestone: Calcium Carbonate
Shale: Clay Minerals
Kimberlite: Diamonds
Realgar: Arsenic
Cinnabar: Mercury

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