Slate is metamorphic rock, like the marble. It is formed from the low-grade metamorphism of the sedimentary rock shale and volcanic ash deposited on sea floors. The rugged look of slate imparts it a distinct appeal. Slate also provides high slip resistance and is long lasting. All these factors make it the ideal stone for a number of applications including home interiors and exteriors, roofing, flooring, fireplaces, wall claddings, landscaping, driveways, patios and pools. Slate can also contain some of the same minerals found in granite, which make some slates iridescent and/or hard.