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.