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Table 3. Chemical composition (wt. percent) of essentially unmineralized H8 dolostone marble of Bayan Obo.

[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         

Coarse-grained

 

Fine-grained

7B25-1

7B34-16

7B34-14

SiO2

0.57

0.46

5.81

Al2O3

*

*

 

*

1 Fe2O3

4.56

3.97

 

4.41

MgO

17.5

17.2

 

17.1

CaO

31.4

32.1

 

28.7

Na2O

*

*

 

*

K2O

*

.04

 

*

TiO2

*

*

 

*

P2O5

1.52

3.23

 

.31

MnO

.69

.62

 

.73

CO2

44.2

43.7

 

43.4

Cl

*

*

 

*

F

.10

.23

.03

BaO

.05

.01

 

.02

SrO

.83

.63

 

.22

Ce2O3

.02

.04

 

.46

La2O3

.01

.02

 

.26

Nd2O3

.01

.02

 

.20

Nb2O5

.06

.21

 

<.01

Total

101.52

102.48

 

101.66

-O=F

0.04

0.10

 

0.01

Total

101.48

102.38

 

101.65

Total RE2O3

0.04

0.08

 

0.92
1Total Fe as Fe2O3.

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Last updated 12.17.97