# Trace Elements and Mineralogy of Upper Permian (Zechstein)
## 6 Results
### Mineral Composition of Potash-Bearing Deposits
\begin{table}
\begin{tabular}{c c c c c} \hline \hline  & \multicolumn{3}{c}{**Number (Percent) of Analyses with Detected Mineral**} \\ \cline{2-5}
**Mineral Chemical Formula** & \multicolumn{3}{c}{**Cyclothem and Lithost stratigraphic Unit**} & **Sum (Percent) of Analyses with Detected Mineral** \\ \cline{2-5}
**PZ1,** & **PZ2,** & **PZ3,** & **PZ3,** & **Detected Mineral** \\  & **Polyhalites within A1d** & **Na2+K2 and K2** & **Na3+K3 and K3** & \\ \hline \multicolumn{5}{c}{\({}^{+}\) hexahydroite} \\ Ca[B(OH)\({}_{4}\)]\({}_{2}\cdot\)2\(\cdot\)H\({}_{2}\)O or & - & - & 1 (0.39) & 1 (0.18) \\ CaB\({}_{2}\)O\({}_{4}\cdot\)6H\({}_{2}\)O & & & & \\ \hline \multicolumn{5}{c}{**kainite} \\
4 KCl\({}^{+}\)4 MgSO\({}_{4}\cdot\)11H\({}_{2}\)O & - & 21 (8.13) & 25 (9.84) & 46 (8.63) \\ \hline \multicolumn{5}{c}{**kieserite} \\ MgSO\({}_{4}\cdot\)H\({}_{2}\)O & - & 32 (12.4) & 44 (17.32) & 76 (14.25) \\ \hline \multicolumn{5}{c}{**langbeinite} \\ K\({}_{2}\)SO\({}_{4}\cdot\)MgSO\({}_{4}\cdot\)4H\({}_{2}\)O & - & 2 (0.77) & 4 (1.57) & 6 (1.12) \\ \hline \multicolumn{5}{c}{**leonite} \\ K\({}_{2}\)SO\({}_{4}\cdot\)2 MgSO\({}_{4}\) & - & 2 (0.77) & 1 (0.39) & 3 (0.56) \\ \hline \multicolumn{5}{c}{**loseuite} \\
6 Na\({}_{2}\)SO\({}_{4}\cdot\)MgSO\({}_{4}\cdot\)15H\({}_{2}\)O & - & 2 (0.77) & - & 2 (0.37) \\ \hline \multicolumn{5}{c}{\({}^{*}\) magnetise} \\ MgCO\({}_{3}\) & 2 (9.52) & 6 (2.32) & 4 (1.57) & 12 (2.25) \\ \hline \multicolumn{5}{c}{\({}^{+}\) nantokite} \\ CuCl & - & 1 (0.38) & 1 (0.39) & 2 (0.37) \\ \hline \multicolumn{5}{c}{**picromerite} \\ K\({}_{2}\)SO\({}_{4}\cdot\)MgSO\({}_{4}\cdot\)6H\({}_{2}\)O & - & 1 (0.38) & - & 1 (0.18) \\ \hline \multicolumn{5}{c}{**polyhalite} \\ K\({}_{2}\)SO\({}_{4}\cdot\)2 CaSO\({}_{4}\cdot\)MgSO\({}_{4}\cdot\)2H\({}_{2}\)O & 9 (42.85) & 20 (7.75) & 6 (2.36) & 35 (6.56) \\ \hline \multicolumn{5}{c}{\({}^{+}\) spodumene} \\ LiAlSi\({}_{2}\)O\({}_{6}\) & - & 2 (0.77) & 1 (0.39) & 3 (0.56) \\ \hline \multicolumn{5}{c}{**starkeyite (leonharite)} \\ MgSO\({}_{4}\cdot\)4H\({}_{2}\)O & - & 1 (0.38) & 3 (1.18) & 4 (0.75) \\ \hline \multicolumn{5}{c}{**sylite} \\ KCl & - & 34 (13.17) & 24 (9.44) & 58 (10.88) \\ \hline \multicolumn{5}{c}{\({}^{+}\) trevortic} \\ Ni\({}^{2+}\)Fe\({}^{3+}\)2O\({}_{4}\) & - & - & 1 (0.39) & 1 (0.18) \\ \hline \multicolumn{5}{c}{\({}^{*}\) quartz} \\ SiO\({}_{4}\) & - & 16 (6.20) & 2 (0.78) & 18 (3.37) \\ \hline \multicolumn{5}{c}{\({}^{+}\) talc} \\ Mg\({}_{3}\)Si\({}_{4}\)O\({}_{10}\)(OH)\({}_{2}\) & - & 6 (2.32) & 2 (0.78) & 8 (1.50) \\ \hline \multicolumn{5}{c}{chlorite group} \\ \multicolumn{5}{c}{\({}^{*}\) pyrite} \\ FeS\({}_{2}\) & - & 5 (1.93) & 2 (0.78) & 6 (1.12) \\ \hline \multicolumn{5}{c}{\({}^{+}\) boracite} \\ Mg\({}_{2}\)B\({}_{7}\)O\({}_{13}\)Cl & - & 5 (1.93) & 2 (0.78) & 7 (1.31) \\ \hline \multicolumn{5}{c}{\({}^{+}\) boracite} \\ Mg\({}_{2}\)B\({}_{7}\)O\({}_{13}\)Cl & - & 3 (1.16) & 1 (0.39) & 4 (0.75) \\ \hline \multicolumn{5}{c}{\({}^{+}\) hydrotalcite} \\ Mg\({}_{6}\)Al\({}_{2}\)(CO\({}_{3}\))(OH)\({}_{16}\)\(\cdot\)4H\({}_{2}\)O & - & 1 (0.38) & - & 1 (0.18) \\ \hline \multicolumn{5}{c}{\({}^{*}\) goethite} \\ \(\alpha\)-Fe\({}^{+}\)O(OH) & - & 1 (0.38) & - & 1 (0.18) \\ \hline \multicolumn{5}{c}{\({}^{*}\) clestite} \\ SrSO\({}_{4}\) & - & 1 (0.38) & - & 1 (0.18) \\ \hline carbonates & - & - & 2 (0.78) & 2 (0.37) \\ \hline \hline \end{tabular}
\end{table} 
Table 4: _Cont._As far as the frequency is concerned, five groups of minerals are proposed: very rare (<1%), rare (1 to <5%), frequent (5 to <10%), common (10 to <20%), and dominant (\(\geq\)20%) minerals. The analysed potash-bearing sulphates of PZ1 cyclothem (two XRD analyses and eight petrographic studies; Table 2) are composed by dominated anhydrite and polyhalite (>42%, Figure 11). Gypsum as a secondary (after hydration of anhydrite) mineral is rare (4.8%) compared to magnesite (9.5%).