|
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No.
|
Element |
Percentage
by weight |
1 |
Oxygen |
45.6 |
2 |
Silicon |
27.3 |
3 |
Aluminium |
8.4 |
4 |
Iron |
6.2 |
5 |
Calcium |
4.7 |
6 |
Magnesium |
2.8 |
7 |
Sodium |
2.3 |
8 |
Potassium |
1.8 |
9 |
Hydrogen |
1.5 |
10 |
Titanium |
0.6 |