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For example, roof slate referred to shale above a coal seam, and draw slate referred to shale that fell from the mine roof as the coal was removed. [ 16 ] The British Geological Survey recommends that the term "slate" be used in scientific writings only when very little else is known about the rock that would allow a more definite classification.
Example of the interlocking slate ridging patented by Moses Kellow and produced at Parc (this example is on the former toll house at Porthmadog, which became the offices for the Croesor quarry) The Romans were the first to mine and install standard-sized slate on roofs.
Slate – Metamorphic rock - A low grade metamorphic rock formed from shale or silts; Suevite – Rock consisting partly of melted material formed during an impact event – A rock formed by partial melting during a meteorite impact; Talc carbonate – A metamorphosed ultramafic rock with talc as an essential constituent; similar to a serpentinite
Slate is an example of a foliated metamorphic rock, originating from shale, and it typically shows well-developed cleavage that allows slate to be split into thin plates. [19] The type of foliation that develops depends on the metamorphic grade. [20]
Collyweston stone slate – Traditional limestone roofing material of central England (not a "true slate"; thin-bedded limestone) Cotham Marble – Limestone variety from Great Britain (not a "true marble"; stromatolitic limestone) Cotswold stone – oolitic limestone used for building and roofing in the Cotswolds
Since slate is formed in the lower realm of metamorphism, based on pressure and temperature, slate retains its stratification and can be defined as a hard, fine-grained rock. [3] Slate is often used for roofing, flooring, or old-fashioned stone walls. It has an attractive appearance, and its ideal cleavage and smooth texture are desirable.
Slate shingles may be cut in a variety of decorative patterns and are available in several colors. Flagstone shingles are a traditional roofing material. Some stone shingles are fastened in place but some simply are held by gravity, so the roof pitch cannot be too steep or the stones will slide off the roof.
Slate is an example of a foliated metamorphic rock, originating from shale, and it typically shows well-developed cleavage that allows slate to be split into thin plates. [36] The type of foliation that develops depends on the metamorphic grade.