Table 5. Chemical composition (wt. percent) of huanghoite, apatite, and aegirine augite of Bayan Obo.
[Analysts: J.M. Back and J.A. Minkin. Analysis by electron microprobe analysis (EPMA). --, not analyzed.
*, below minimum detection level (MDL); MDL for Pr2O3=0.09, Y2O3=0.07, P2O5=0.04, TiO2=0.04, MnO=0.04, MgO=0.06, and K2O=0.01]
|
Constituent |
Huanghoite |
Apatite |
Apatite |
Aegirine augite |
|
La2O3 |
7.98 |
0.15 |
0.52 |
-- |
|
BaO |
37.05 |
-- |
-- |
-- |
|
Nd2O3 |
9.12 |
.19 |
1.10 |
-- |
|
Ce2O3 |
23.14 |
.35 |
1.46 |
-- |
|
Pr2O3 |
2.70 |
* |
.25 |
-- |
|
Y2O3 |
.11 |
* |
1.05 |
-- |
|
CaO |
.05 |
53.08 |
49.79 |
-- |
|
P2O5 |
* |
41.35 |
39.56 |
-- |
|
F |
4.00 |
4.87 |
-- |
-- |
|
SiO2 |
-- |
-- |
-- |
52.56 |
|
TiO2 |
-- |
-- |
-- |
* |
|
Al2O3 |
-- |
-- |
-- |
.45 |
|
1Fe2O3 |
-- |
-- |
-- |
33.67 |
|
MnO |
-- |
-- |
-- |
* |
|
MgO |
-- |
-- |
-- |
* |
|
CaO |
-- |
-- |
-- |
.15 |
|
Na2O |
-- |
-- |
-- |
13.51 |
|
K2O |
-- |
-- |
-- |
* |
|
Total |
84.15 |
99.99 |
93.73 |
100.34 |
|
-O=F |
1.69 |
2.05 |
|
|
|
Total |
82.46 |
97.94 |
93.73 |
100.34 |
This page is https://pubs.usgs.gov/bulletin/b2143/table5.html
Maintained by John Watson
Last updated 12.17.97