About 8% of the Earth’s crust is aluminium, making it the most abundant metal on this planet. However, it is always found combined with various other elements, never by itself in a pure state. Two of the most frequently encountered aluminium compounds are alum and aluminium oxide. It is the third most abundant element in the Earth’s crust, after oxygen (46.6%) and silicon (27.77%).
Aluminum, Al, is the third most common element in the Earth’s crust with 8.1 percent of the crust’s mass.
All the earth’s aluminum is combined with other elements to form compounds, and it is never found as a lone element. Aluminum oxide (Al2O3), aluminum hydroxide (Al(OH)3) and potassium aluminum sulfate (KAl(SO4)2) are common aluminum compounds. Aluminum and aluminum alloys have a variety of uses from kitchen foil to rocket manufacturing.
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