Why will an iron-rich olivine have a higher density than a magnesium-rich olivine?
A) More magnesium is needed to equal the same atomic charge as iron.
B) Iron-rich olivine has smaller crystals, so more of them will fit into the same area.
C) Magnesium-rich olivine has more silicon, which is less dense.
D) Iron has a greater atomic mass than magnesium and therefore is heavier.
Answer: D
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