Iron and magnesium ions are similar in size and both have a +2 positive charge.Therefore,we would expect iron and magnesium to

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Iron and magnesium ions, due to their similar size and charge, can often substitute for each other in the crystal lattices of minerals. This substitution occurs because the similar ionic sizes and charges allow them to fit into the same sites within the mineral structures without significantly disrupting the mineral's overall crystal structure.

Iron and Magnesium Ions Are Similar in Size and Both