Greywacke thin section from Scotland.

  Greywacke, crossed polars view. The quartz is less abundant, a lot of  feldspars is present in this section. High birefringence carbonate can also be seen as well as some other high polarization colored minerals.

    Greywacke plane polarized view. Some green minerals (amphiboles ?) can be seen in this micrograph. This section exhibits some regions with different colors inter grains materials.

    Higher magnification view of this section in LPA and LPNA. Opaque minerals not identified are also widespread in this rock section.