sample nb.

132

132

132

132

132

132

SiO₂ (wt%)

50.71

50.67

52.08

49.4

50.63

51.66

Al₂O₃

28.40

30.51

30.31

32.34

30.66

31.25

FeO

1.30

0.70

0.55

0.39

0.54

0.68

CaO

12.93

12.4

12.07

14.11

13.55

13.86

Na₂O

4.12

3.84

4.13

3.20

3.25

3.30

K₂O

0.66

0.34

0.34

0.15

0.25

0.24

Total

98.12

98.46

99.48

99.57

98.88

100.98

Si (apfu)

2.319

2.335

2.371

2.26

2.331

2.331

Al

1.531

1.657

1.626

1.744

1.664

1.661

Fe²⁺

0.000

0.027

0.021

0.015

0.021

0.026

Ca

0.634

0.612

0.589

0.691

0.668

0.670

Na

0.366

0.344

0.366

0.284

0.291

0.289

K

0.038

0.020

0.02

0.009

0.015

0.014

An (%)

64

64

61

71

69

69

Ab

32

34

37

28

30

30

Or

3

2

2

1

2

1