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Table 6

Planetary abundances in wt % (Fe, O, Mg, Al, Si, Ca) or weight ppm (C, Na) of Mercury and Venus (Morgan & Anders 1980), Earth (Kargel & Lewis 1993) and Mars (Lodders & Fegley Jr 1997)

Mercury Venus Earth Mars

Fe 64.47 31.17 32.04 27.24
O 14.44 30.9 31.67 33.75
Mg 6.5 14.54 14.8 14.16
Al 1.08 1.48 1.43 1.21
Si 7.05 15.82 14.59 16.83
Ca 1.18 1.61 1.6 1.33
C 5.1 468 44 2960
Na 200 1390 2450 5770

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