Brittany, Francei

Regional Level Types
Brittany	Region
France	Country

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Brittany (Bretagne) is a region in north-western France, projecting into the Atlantic Ocean and bordered by the English Channel to the north and the Bay of Biscay to the south. It covers approximately 27,200 km² and is characterised by a deeply indented coastline with peninsulas, islands, rocky headlands, and broad bays, as well as a low, gently undulating interior. The region has no very high mountains, but its landscape is shaped by ancient erosion surfaces, river valleys, and extensive coastal processes. Major rivers include the Vilaine, Aulne, and Blavet, all relatively short but important for drainage and settlement.

Geologically, Brittany forms the western part of the Armorican Massif, one of the oldest geological units in France. The region is underlain predominantly by Precambrian and Palaeozoic crystalline and metamorphic rocks, including granites, gneisses, schists, and quartzites, formed and deformed during the Variscan (Hercynian) orogeny. These ancient rocks give rise to rugged coastal cliffs, rocky headlands, and resistant inland plateaus. Sedimentary cover is limited and mostly confined to small basins and coastal areas, while Quaternary deposits occur along river valleys and shorelines. Brittany’s geology has made it a classic area for studying ancient continental crust and Variscan tectonics.

This geological foundation has supported a long-standing mineral and extractive heritage. Brittany has historically produced tin, lead, zinc, and iron, with mining activity dating back to prehistoric and Roman times. Quarrying has been particularly important, especially of granite, slate, and other hard stones used for building, roofing, and monuments; these materials strongly define the region’s traditional architecture. Industrial mineral extraction has generally been small-scale, but the widespread use of local stone reflects the close relationship between geology and cultural landscape.

Administratively, Brittany is divided into four departments: Côtes-d’Armor, Finistère, Ille-et-Vilaine, and Morbihan, with Rennes as the regional capital. Brittany is also notable for its strong and distinctive cultural identity, rooted in its history as an early medieval kingdom and later a duchy. The Breton language, a Celtic language related to Welsh and Cornish, remains an important cultural symbol, alongside regional traditions, music, and place names. This sense of identity is closely tied to the region’s geography and geology, which have long fostered relative isolation, maritime connections, and a landscape strongly shaped by ancient rock and human use of stone.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

Mineral list contains entries from the region specified including sub-localities

343 valid minerals. 6 (TL) - type locality of valid minerals. 1 erroneous literature entry.

Rock Types Recorded

Rock list contains entries from the region specified including sub-localities