In the mineral olivine, iron and magnesium can substitute freely in the crystal for all of the following reasons EXCEPT:

Name: In the mineral olivine, iron and magnesium can substitute freely in the crystal for all of the following reasons EXCEPT:
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Quizplus · Accepted Answer

Iron and magnesium do not have the same atomic mass, which is why this is the exception. They can substitute for each other because they have similar ionic sizes and the same charge, and both are abundant in the Earth's crust.

In the Mineral Olivine, Iron and Magnesium Can Substitute Freely