SiO2

Al2O3

Fe2O3

0.2MPa

0.42MPa

Corundum

Japan

8.1

90.5

0.5

0.4

2.17

0.23

0.29

Corundum

South Africa

9.5

87.8

1.0

1.6

3.16

0.18

0.46

Mullite

Japan

26.6

70.5

1.5

1.4

6.68

0.24

Mullite

Japan

24.4

73.0

1.5

1.1

5.27

0.04

Mullite

South Africa

24.5

72.5

1.0

2.1

4.22

0.20

0.25

Bauxite

South Africa

11.6

83.6

1.3

3.5

1.05

0.64

0.80

Andalusite

South Africa

39.5

58.3

1.3

0.9

3.94

0.12

0.25

Andalusite

Alumina

South Africa

31.5

67.0

1.0

0.8

10.62

0.08

0.10