Agricultural & Natural Resources Development Home Page | Land Reclamation Home Page | Effect of Digestion Method, Siderite Content, and Fizz Rating on Neutralization Potential of Overburden Samples
Table 3. Minerals (%) identified by X-ray
diffraction for 31 overburden samples collected from Pennsylvania
and West Virginia. Based on their mineralogy and concentration of
major elements (Table 4), the samples were divided into groups
containing primarily iron (Fe group), calcium (Ca group), sulfur
(S group), and silicon (Si group). 
| Sample | Siderite |
Calcite |
Pyrite |
Quartz |
Clay@ Minerals |
| Fe | |||||
1* |
49 |
0 |
0 |
2 |
35 |
2 |
65 |
0 |
0 |
1 |
35 |
3 |
65 |
0 |
1 |
1 |
34 |
4 |
61 |
0 |
1 |
1 |
37 |
5 |
18 |
1 |
9 |
24 |
48 |
6 |
20 |
11 |
1 |
21 |
47 |
| Ca | |||||
1^ |
0 |
90 |
1 |
1 |
6 |
2^ |
0 |
83 |
0 |
8 |
8 |
3# |
0 |
23 |
2 |
14 |
21 |
| S | |||||
1 |
0 |
0 |
63 |
18 |
20 |
2^ |
0 |
18 |
22 |
34 |
24 |
3t |
1-3 |
0 |
>20 |
>20 |
1-3 |
4 |
0 |
0 |
13 |
26 |
61 |
5t |
1-3 |
0 |
1-3 |
>20 |
>20 |
| Si | |||||
1 |
1 |
0 |
0 |
83 |
16 |
2 |
1 |
0 |
1 |
76 |
23 |
3 |
1 |
1 |
1 |
71 |
27 |
4& |
1 |
2 |
0 |
69 |
28 |
5 |
1 |
1 |
1 |
63 |
28 |
6 |
1 |
0 |
0 |
52 |
47 |
7 |
0 |
0 |
2 |
57 |
42 |
8^ |
1 |
0 |
0 |
42 |
55 |
9 |
0 |
0 |
2 |
53 |
45 |
10 |
1 |
0 |
0 |
50 |
48 |
11 |
3 |
0 |
0 |
54 |
43 |
12 |
3 |
0 |
1 |
46 |
50 |
13 |
1 |
9 |
1 |
45 |
44 |
14 |
1 |
0 |
1 |
42 |
56 |
15 |
1 |
1 |
2 |
39 |
55 |
16 |
3 |
1 |
1 |
43 |
51 |
17 |
8 |
2 |
0 |
34 |
55 |
@Clay minerals include kaolinite, illite, chlorite, muscovite, and feldspar.
tMineralogy data are only semi-quantitative for S3 and S5, analyzed by PA Geologic Survey.
*Fe1 contained 14% hematite.
#Ca3 contained 40% dolomite.
&Si4 contained 7% dolomite.
^Ca1, Ca2, S2, and R8 all had 2% dolomite.
