% oxide

B4

bulk

VGLC

B4.18

VGLC

B4.20

VGLC

B4.23

DP

B4.18

DP

B4.20

DP

B4.23

CP1

B4.18

CP2

B4.20

CP3

B4.23

fine crystals

SiO₂

64.38

68.48

68.86

69.24

57.62

56.99

56.95

56.89

52.60

52.14

60.05

Al₂O₃

14.55

14.13

14.21

14.11

14.69

15.40

16.75

15.73

15.33

15.19

25.67

Na₂O

5.79

5.71

5.70

5.77

4.61

4.00

4.69

3.35

3.42

4.24

5.89

K₂O

2.47

2.96

2.91

2.99

1.82

1.44

1.19

1.11

1.16

0.49

0.74

CaO

2.90

1.69

1.00

1.62

5.34

7.02

6.65

7.01

7.08

9.03

7.65

MgO

1.30

0.87

0.97

1.27

2.19

3.40

2.75

3.85

3.86

3.10

nd

FeO

7.82

6.17

5.93

4.72

11.30

10.40

9.73

9.77

13.18

12.09

nd

TiO₂

0.65

nd

0.42

0.28

2.41

1.35

1.29

1.23

2.37

2.16

nd

SO₃

0.03

nd

nd

nd

nd

nd

nd

0.54

0.25

nd

nd

Cl₂O

0.11

nd

nd

nd

nd

nd

nd

0.35

0.75

1.55

nd

Ratio

SiO₂/Al₂O₃

4.42

4.84

4.84

4.91

3.92

3.70

3.40

3.62

3.43

3.43

2.33

SiO₂/FeO

8.23

11.09

11.61

14.67

5.10

5.48

5.85

5.82

3.99

4.31

-

SiO₂/CaO

22.20

40.52

68.86

42.74

10.73

8.12

8.56

8.12

7.43

5.77

7.84