Oxides, wt%

1 (13)

2 (3)

3 (15)

Al₂O₃

9.36

8.82

0.39

Cr₂O₃

61.73

57.50

59.14

FeO

17.82

25.64

35.76

MnO

0.15

1.57

2.10

MgO

9.81

3.08

0.69

ZnO

н.о

2.76

1.76

Total

98.87

99.37

99.84

Cr/(Cr + Al)

0.90

0.89

0.99

Fe/(Fe + Mg)

0.70

0.91

0.99

Components (%):

MgAl₂O₄

13

11

0.5

FeAl₂O₄

–

1

–

(Fe, Mg)Cr₂O₄

64

–

5

FeCr₂O₄

21

78

81

MnCr₂O₄

0.5

–

–

(Zn, Mn)Cr₂O₄

–

7

–

ZnCr₂O₄

–

2

–

MnFe₂O₄

–

–

2

(Zn, Mn)Fe₂O₄

–

–

10

FeFe₂O₄

–

–

1