Slate: Meaning (information, definition, explanation, facts)

Alternate meanings in Slate (disambiguation)

Slate is a fine-grained homogeneous sedimentary rock composed of clay or volcanic ash which has been metamorphosed (foliated) in layers (bedded deposits). Slate can be made into roofing shingles ('roofing slates' in the UK) because it has two lines of breakability: cleavage and grain. This makes it possible to split slate into thin sheets of rock used for roofing shingles .

When choosing roofing materials, one must take into consideration the longevity of the roofing material, as well as the installation cost. Slate roofs have been known to last hundreds of years in comparison to the synthetic roof which typically lasts 10-20 years. Synthetic and manufactured roofing materials may initially save money at the time of installation, but the slate roof will last many lifetimes, making it the more permanent, economical decision.

Some of the finest slates in the world come from Wales in the United Kingdom and The Slate Valley of Vermont and New York.

See also: List of minerals