pH

Total SiO₂ %

Al₂O₃%

Fe₂O₃%

Feldspar %

2.0

67.62

13.80

0.140

66.24

2.0 - 3.0

65.91

15.30

0.120

75.86

4.0 - 4.5

68.46

12.80

0.145

61.44