Answer :
46.6% Oxygen
27.7% Silicon
8.1% Aluminium
5.0% Iron
3.6% Calcium
2.8% Sodium
2.6% Potassium
2.1% Magnesium
27.7% Silicon
8.1% Aluminium
5.0% Iron
3.6% Calcium
2.8% Sodium
2.6% Potassium
2.1% Magnesium