Table 2 Chemical composition analysis of basalt

Silicon dioxide (SIO₂)

44.79

Aluminum oxide (AL₂O₃)

10.16

Iron oxide (Fe₂O₃)

13.89

Calcium oxide (CaO)

13.62

Magnesia MgO

8.89

Sulphuric anhydride (SO₃)

0.26

Potassium oxide (K₂O)

0.6

Sodium oxide (Na₂O)

2.3

Chloride (CL)

0.12

Loss in ignition LOI

4.5

SM (silica modulus)

1.86

AM (aluminum modulus)

0.73

Moisture

4.5