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Table 1 Feldspar composition

From: Bristen granite: a highly differentiated, fluorite-bearing A-type granite from the Aar massif, Central Alps, Switzerland

Feldspar

Plag

Plag

Plag

Kfs

Kfs

Plag

Kfs

Geol. unit

Brgr

Brgr

Brgr

Brgr

Brgr

cAgr

cAgr

# Points

11

1

1

24

1

9

7

SiO2

68.45

68.57

67.85

64.45

64.78

68.49

63.43

Al2O3

20.02

19.86

20.39

18.28

18.2

20.23

18.8

FeO

0.07

0.07

bd

0.07

0.11

0.03

0.06

CaO

0.56

0.02

0.94

0.01

0.03

0.67

2.14

Na2O

11.46

11.61

10.64

0.44

0.6

11.52

0.57

K2O

0.13

0.13

0.15

15.97

16.58

0.08

15.07

Total

100.72

100.27

100

99.24a

100.31a

101.03

100.08b

Oxygen

8

8

8

8

8

8

8

Si

2.974

2.987

2.964

2.999

2.995

2.967

2.968

Al

1.025

1.019

1.050

1.003

0.992

1.033

1.037

Fe(2)

0.003

0.003

–

0.003

0.004

0.001

0.002

Ca

0.026

0.001

0.044

0.000

0.001

0.031

0.001

Na

0.965

0.980

0.901

0.040

0.054

0.967

0.051

K

0.007

0.007

0.008

0.948

0.978

0.004

0.959

An

2.61

0.09

4.61

0.05

0.14

3.10

0.10

Ab

96.67

99.17

94.51

4.02

5.21

96.46

5.11

Or

0.72

0.73

0.88

95.93

94.65

0.44

94.79

  1. aTotal includes 0.1 wt % Rb2O
  2. bTotal includes 2.14 wt% BaO; TiO2, MnO and MgO below detection limit (bd) of ~ 0.05 wt%