Spanish slate is a foliated, metamorphic rock created from fine-grained sediments over the course of millions of years. Is mainly composed of quartz, sericite and minerals of the chlorite group. Unlike UK slate where we find a greater variety of colors, Spanish slate is usually black or gray.
The lithotype for spanish roofing slates is B1, which according to the International Classification of Slate for Roofs (IRSC) corresponds to an authentic black-gray slate, fine grain, homogeneous and with a high fissibility, which allows it to be exfoliated in fine and regular tiles.
Slate has a long tradition as a construction product. Its strength and outstanding resilience make it one of the most durable and versatile materials mainly used for roofing and cladding.
Today, most slate used in the UK has a Spanish origin and are used for high end projects, historical buildings, traditional pitched-roof housing and sustainable architecture.