Location of sample

SiO₂

Fe₂O₃

Al₂O₃

MgO

CaO

MnO

Cr₂O₃

NiO

CoO

LOI

Sum

Base of face

70.17

19.44

1.44

4.11

0.58

0.02

1.10

0.84

0.05

2.38

100.13

Middle of the face

16.86

53.36

15.04

3.78

1.19

0.07

1.79

0.52

0.08

6.95

99.63

Top of face

7.79

68.68

5.97

3.45

0.58

0.06

4.65

1.06

0.06

7.93

100.24