Material/Twenty most abundant elements in Earth's crust

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Approx figures for the 20 most abundant elements in Earth's crust:

Earth's crust
Element  % mass
Oxygen 46.71
Silicon 27.69
Aluminum 8.07
Iron 5.05
Calcium 3.65
Sodium 2.75
Potassium 2.58
Magnesium 2.08
Titanium 0.62
Hydrogen 0.14
Phosphorus 0.13
Carbon 0.09
Manganese 0.09
Sulfur 0.05
Barium 0.05
Chlorine 0.05
Chromium 0.04
Fluorine 0.03
Zirconium 0.03
Nickel 0.02

Figures from [1]
Figures rounded to two decimal places
Also need to have a list based on ease of extraction and energy required

Noticeable missing from top 20:

  • Copper. (Carbon might eventually replace copper for many electrical conduction applications, and in the right form has the potential to be an even more efficient conductor - see carbon nanotube 11px-Wikipedia_logo.jpg)