Stone : andalousite-bearing schist
Type : metamorphic rock derived from a sedimentary rock
Age : between 450 and 470 million years / Metamorphism event : 315 million years
Quarry : Guerphales, Glomel (Côtes d’Armor)
![](local/cache-vignettes/L1920xH1032/d469d5bfa0c32c44ca1c221eacd6b8-f218e.jpg?1711120119)
Stone : andalousite-bearing schist
Type : metamorphic rock derived from a sedimentary rock
Age : between 450 and 470 million years / Metamorphism event : 315 million years
Quarry : Guerphales, Glomel (Côtes d’Armor)