Slate is a fine-grained, metamorphic stone derived from sedimentary rock shale. It is uniform in color, available in shades such as dark to light green, mottled purple, black, gray or dark red. Veined patterns from overseas have also recently been introduced. Unless its surface has been honed smooth, slate can be recognized by its distinct cleft pattern.

Slate is a popular flooring material. Slate is often used for exterior paving stones, or pavers. Additional slate applications include kitchen counter tops, fireplace facings, tabletops, and roofing.