What Are Slate Tiles?

Slate is a foliated, fine-grained metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash that shows no clear compositional layering, but can be easily split into thin slabs and plates. Because it is a good electrical insulator and fireproof, it was used to construct electric switchboards in the early 20th century. Slate having those properties and great thermal stability makes it a top choice for a fireplace hearth and an area with underfloor heating.