It shows as a fine to medium-grained
granite. Unlike other granitic intrusions present in the Gotthard Massif (Gamsboden Granite and Fibbia Granite), the
foliation is only very weakly developed and is mostly visible in ductile
shear zones.
Radiometric dating showed an age of 294
Ma. On surface, it outcrops over an area of 20–25 km2. The Rotondo Granite forms at least part of
Monte Prosa. == Bedretto Underground Laboratory for Geoenergies ==