The slate quarry
Slate is a type of metamorphic rock found in large quantities in certain areas of Brittany (especially the Maël-Carhaix region). Breton slate is particularly popular due to its low pyrite content, which minimizes oxidation. It has long been used as a roofing material for prestigious homes and buildings, including the Sorbonne and Chapelle des Invalides in Paris and the Parlement of Brittany in Ren nes. In the early 20th century, Brittany’s slate quarries generated much economic activity, with hundreds of workers toiling daily to extract the famous stone.