Sudoit (?dioktaedrischer Chlorit“, ?Al-Chlorit“) im Cornberger Sandstein von Cornberg/Hessen

Sudoite, muscovite, and quartz are authigenic minerals of the Cornberger Sandstein, the youngest eolian member of the uppermost Lower Permian. The sudoite is to a great extent similar to the material from the Kesselberg area (Black Forest, Germany).

$$\begin{gathered} n_z \approx n_z = 1.572 \pm 0.002 \hfill \\ \underline {{\text{ }}n_x = 1.568 \pm 0.003} \hfill \\ {\text{ }}\Theta \Delta = 0.004 \pm 0.003 \hfill \\ \end{gathered} $$