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There are 108 elements, and they can be combined in so many different ways you might wonder how many minerals can occur naturally. However, although 108 elements exist, they aren't all common - the earth's crust is composed *mostly* of eight important elements: oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium. Together, they account for 98.59% of the earth's crust by weight.
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