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How does calcium’s abundance in the Moon’s crust compare with its abundance in Earth’s crust?

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A labeled diagram of the periodic table entry for calcium, showing its atomic number 20, symbol Ca, atomic weight 40.078, electron configuration, and classification as an alkaline-earth metal. Icons indicate calcium is a solid with a face-centered cubic crystal structure and strongly basic oxides at room temperature. — calcium The chemical element calcium is the most abundant metallic element in the human body.

Calcium is more abundant in the Moon’s crust than in Earth’s crust. Specifically, calcium constitutes approximately 8 percent of the Moon’s crust, whereas it makes up about 3.64 percent of Earth’s crust.1