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12 July, 03:19

How would you expect the appearance of a rock high in iron and magnesium to differ from a rock with very little iron and magnesium?

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  1. 12 July, 03:38
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    High iron and magnesium rocks have a high percentage of dark-colored (mafic) minerals.

    So the high iron and magnesium would be darker than the low iron and magnesium.
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