In some places it is possible to confuse schist boulders with schist basement.
The schists are dark bluish grey, fine-grained with a high quartz content (> 60 vol. %) and possess a continuous schistosity.
The contact between granite and schist is intrusive, generally cross-cutting a pre-existing schistosity.
These zones show the effects of intense alteration: the granite is transformed into a quartz-sericite-andalusite schist.
The magnetization in the veins, schist and sandstones is interpreted to have been acquired when the haematite was precipitated.
The soils are well drained and derived from schist.
In schist intercalations within the marbles mineral assemblages include chlorite, calcite, albite, phengite and quartz.
The schist is composed mainly of biotite, plagioclase and quartz, whereas granulitite consists mainly of quartz, plagioclase and biotite.
