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Table 4. Chemical composition (wt. percent) of REE-mineralized H8 dolostone marble of Bayan Obo.

[Samples are listed from left to right in order of increasing total RE2O3 content.
Analysts: J.E. Taggart, A. Bartel, and D. Siems. Analysis by wavelength-dispersive X-ray fluorescence spectrometry (WDXRF) for SiO2, Al2O3, total iron as Fe2O3, MgO, CaO, Na2O, K2O, TiO2, P2O5, and MnO.
Analysts: E. Brandt, C. Papp, and J. Sharkey. Analysis by coulometric titration for CO2 and by ion-selective electrode (ISE) for Cl and F.
Analyst: P.H. Briggs. Analysis by inductively coupled plasma-mass spectrometry (ICP-MS) for BaO, SrO, Ce2O3, La2O3, Nd2O3, and Nb2O5.
*, below minimum detection level (MDL); MDL for Al2O3=0.10, Na2O=0.15, K2O=0.02, TiO2=0.02, Cl=0.01]

Constituent          

7B36-10    

7B34-12    

7B14-2    

7B34-10    

7B36-12    

7B36-2    

SiO2

*

10.4

.51

1.36

.20

.20

Al2O3

*

.11

*

*

*

*

1 Fe2O3

7.60

4.97

7.38

9.12

8.30

6.87

MgO

14.7

15.6

16.2

16.8

15.9

15.5

CaO

30.8

26.6

26.8

29.1

28.0

27.9

Na2O

*

*

*

*

*

*

K2O

*

.07

.02

*

*

*

TiO2

.90

*

*

*

.39

.18

P2O5

.49

.88

1.04

1.09

.98

1.00

MnO

2.18

.83

1.14

1.02

2.23

1.23

CO2

42.3

41.5

42.5

46.1

43.7

41.2

Cl

*

*

*

*

*

*

F

2.15

.01

.01

.02

.03

1.51

BaO

.36

.06

.27

.01

.04

.94

SrO

.20

.26

.38

.26

.20

.25

Ce2O3

.55

.76

.91

1.01

1.02

2.11

La2O3

.28

.59

.68

.82

.78

1.52

Nd2O3

.22

.21

.24

.26

.31

.57

Nb2O5

.21

.02

.01

.02

.10

.03

Total

102.94

102.87

98.09

106.99

102.18

101.01

-O=F

0.90

 

 

0.01

0.01

0.64

Total

102.04

102.87

98.09

106.98

102.17

100.37

Total RE2O3

1.05

1.56

1.83

2.09

2.11

4.20
1Total Fe as Fe2O3.

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Last updated 12.17.97