Geology
The rock exposures around St Michael's Mount provide an opportunity to see many features of the geology of Cornwall in a single locality. The mount is made of the uppermost part of a granite intrusion into metamorphosed Devonian mudstones or pelites. The granite is itself mineralised with a well-developed sheeted greisen vein system. Due to its geology the southern coast of the island was designated a Site of Special Scientific Interest in 1995.
Read more about this topic: St Michael's Mount