## 4 Test on Sedimentary Rocks  
The geochemical abundance data of sedimentary rocks in China were collected to test the new proposed geochemical classification method, including a total of 26 types of sedimentary rocks. The contents of major oxides, values of CaO/MgO and WIG, and the classified shale types are listed in Table 2.  
Mudstone (shale) is composed of more clay minerals and fewer clastic minerals, which is equivalent to an argillaceous type in terms of the classification of mineral contents. In terms of geochemical classification, common mudstone (shale), silty mudstone (shale), aluminiferous mudstone (shale), and the average composition of mudstone (shale) all have  
\begin{table}
\begin{tabular}{c l c c c c c c c c c c c} \hline \hline
**ID** & **Rocks** & **SiO\({}_{2}\)** & **Al\({}_{2}\)O\({}_{3}\)** & **TFe\({}_{2}\)O\({}_{3}\)** & **CaO** & **MgO** & **K\({}_{2}\)O** & **NiO\({}_{2}\)** & **TiO\({}_{2}\)O\({}_{3}\)** & **CaO/MgO** & **WIG** & **Classified Types** \\ \hline
1 & Mudstone (shale) (average) & 60.63 & 16.35 & 5.91 & 2.66 & 1.86 & 3.45 & 0.80 & 0.76 & 0.12 & 1.43 & 45.46 & 3 \\
2 & Common mudstone (shale) & 61.98 & 16.24 & 6.17 & 1.81 & 1.96 & 3.61 & 0.88 & 0.77 & 0.13 & 0.92 & 39.42 & 3 \\
3 & Silp mudstone (shale) & 65.57 & 14.24 & 5.44 & 2.01 & 1.73 & 3.27 & 0.96 & 0.71 & 0.12 & 1.16 & 45.63 & 3 \\
4 & Calcareous mudstone (shale) & 53.60 & 12.77 & 4.79 & 8.88 & 2.72 & 3.72 & 0.64 & 0.66 & 0.13 & 3.26 & 125.48 & 4 \\
5 & Aluminiferous mudstone & 54.82 & 24.90 & 6.06 & 0.89 & 0.79 & 2.76 & 0.35 & 0.94 & 0.10 & 1.13 & 16.50 & 3 \\ \hline
6 & Sandstone (average) & 72.63 & 10.91 & 3.67 & 2.52 & 1.26 & 2.40 & 1.41 & 0.49 & 0.09 & 2.00 & 66.84 & 2 \\
7 & Quartz sandstone & 92.76 & 3.36 & 0.97 & 0.21 & 0.21 & 0.83 & 0.11 & 0.14 & 0.03 & 1.00 & 33.14 & 1 \\
8 & Fedisparu quartz sandstone & 81.40 & 8.26 & 2.73 & 0.85 & 0.64 & 1.92 & 0.60 & 0.40 & 0.07 & 1.33 & 42.38 & 1 \\
9 & Greyswade & 67.72 & 12.51 & 4.23 & 3.35 & 1.57 & 2.69 & 1.83 & 0.54 & 0.11 & 2.13 & 73.87 & 2 \\
10 & Arlooseose & 68.53 & 12.65 & 4.00 & 2.78 & 1.55 & 2.70 & 2.44 & 0.52 & 0.11 & 1.79 & 73.86 & 2 \\
11 & Silp sandstone & 69.08 & 13.00 & 4.76 & 1.93 & 1.51 & 2.74 & 1.32 & 0.62 & 0.10 & 1.28 & 49.93 & 2 \\
12 & Blast-sandstone & 70.00 & 12.85 & 4.42 & 1.72 & 1.89 & 2.93 & 2.20 & 0.55 & 0.13 & 0.91 & 58.72 & 2 \\
13 & Calcareous sandstone & 60.72 & 9.44 & 2.94 & 10.10 & 1.79 & 2.24 & 1.25 & 0.43 & 0.10 & 5.64 & 190.62 & 4 \\
14 & Tufufacous sandstone & 68.18 & 14.50 & 3.93 & 1.88 & 1.42 & 3.24 & 2.87 & 0.50 & 0.11 & 1.32 & 64.50 & 2 \\ \hline
15 & Carbonate rock & 6.49 & 1.14 & 0.71 & 42.84 & 6.53 & 0.34 & 0.10 & 0.05 & 0.04 & 6.56 & 4714.75 & 6 \\  & (without argillaceous content) & 10.07 & 1.77 & 0.98 & 40.42 & 6.25 & 0.54 & 0.14 & 0.08 & 0.05 & 6.47 & 2964.03 & 6 \\
16 & (with argillaceous content) & 3.18 & 0.66 & 0.43 & 50.20 & 2.33 & 0.19 & 0.07 & 0.03 & 0.02 & 21.55 & 9398.58 & 6 \\
18 & Argillaceous limestone & 11.39 & 2.24 & 1.19 & 43.00 & 2.94 & 0.61 & 0.18 & 0.11 & 0.06 & 14.63 & 2515.62 & 6 \\
19 & Dolomite & 4.45 & 0.67 & 0.66 & 31.70 & 17.35 & 0.24 & 0.07 & 0.04 & 0.02 & 1.83 & 5100.95 & 5 \\
20 & Argillaceous dolomite & 12.25 & 1.35 & 0.86 & 28 silicate components with a type number of 3. Calcareous mudstone (shale) is classified as having calcsilicate components with a type number of 4. These results indicate the valid discrimination between silicate components and calcsilicate components in the new proposed geochemical classification. Among the nine types of sandstone, three types (numbers of 1, 2 and 4) were represented in the classification results. Quartz sandstone and feldspar quartz sandstone are both classified as type 1 (siliceous components), which is consistent with the fact that the two rocks have high quartz contents. Calcareous sandstone is classified as type 4 (calcsilicate components). The other six sandstones with high contents of feldspar and quartz are classified as type 2 (felsic component).