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The western desert of Egypt was a major source ...

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An alum (/ˈæləm/) is a type of chemical compoun...

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Magnesium sulfate or magnesium sulphate is a ch...

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Iron(II) sulfate (British English: iron(II) sul...

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Silicon dioxide, also known as silica, is an ox...

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Boron is a chemical element. It has the symbol ...

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Magnesium sulfate or magnesium sulphate is a ch...

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Iron(II) sulfate (British English: iron(II) sul...

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