Granite « métamorphisé »

The small pink cliffs are the oldest rocks in France. It is gneiss, a granite “metamorphosed” under the effect of extreme temperatures and pressures in the earth's crust.

There are many colors of granite. In Brittany, gray predominates. It is feldspar, one of the three minerals that make up this rock, which gives it its color. The other two minerals are quartz, resembling coarse salt, and mica, visible as small, shiny, rounded flakes.