Table 2. Chemical composition (wt. percent) of ferroan dolomite from H8 dolostone marble of Bayan Obo.
[Analysts: J.M. Back and J.A. Minkin. Analysis by electron microprobe analysis (EPMA). Suffixes of sample numbers: C, coarse-grained; F, fine-grained. <, less than. For each sample, values represent 5-14 analyses of a total of 5-8 grains. All concentrations were below minimum detection levels (MDL's) for BaO (MDL 0.09 percent), Nd2O3 (MDL 0.16 percent), and Ce2O3 (MDL 0.24 percent). Total Fe as FeO]
|
Oxide |
7B25-1C |
|
7B36-10C |
|
7B36-10F |
|
7B34-15C |
|
7B34-15F |
|||||
|
Range |
Average |
Range |
Average |
Range |
Average |
Range |
Average |
Range |
Average |
|||||
|
CaO |
28.58-29.19 |
28.88 |
|
27.06-27.76 |
27.43 |
|
27.66-28.19 |
27.92 |
|
28.19-29.13 |
28.69 |
|
28.60-29.80 |
29.02 |
|
MgO |
19.24-19.70 |
19.41 |
|
13.78-17.03 |
15.42 |
|
16.64-17.54 |
17.12 |
|
18.51-19.54 |
19.01 |
|
18.15-19.01 |
18.73 |
|
MnO |
.45-.62 |
.55 |
|
1.67-2.48 |
2.11 |
|
1.76-2.46 |
2.11 |
|
.65-.87 |
.77 |
|
.70-.89 |
.80 |
|
FeO |
3.77-4.06 |
3.90 |
|
6.17-10.47 |
8.34 |
|
5.60-6.26 |
6.03 |
|
3.89-5.03 |
4.45 |
|
4.35-4.69 |
4.52 |
|
SrO |
.58-.79 |
.68 |
|
<.12-.38 |
.19 |
|
<.12-.49 |
.20 |
|
<.11-.35 |
.18 |
|
.11-.25 |
.18 |
|
Total |
|
53.42 |
|
|
53.49 |
|
|
53.38 |
|
|
53.10 |
|
|
53.25 |
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Maintained by John Watson
Last updated 12.17.97