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Quartz

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Quartz

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Approximately 100 free elements are found in the earth's crust. There are eight elements that are found in somewhat of an abundance. These include: oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium.

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The abundance of radium in the earth crust is 9.10-10 mg/kg.

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The abundance ratio by mass, in the earth's crust, is 1:2305, approx.

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