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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.
It is home to a number of National Nature Reserves (NNRs), sites of special scientific interest (SSSIs), five areas of outstanding natural beauty (AONBs) and three national parks. Wales has many protected areas including three national parks: Snowdonia, Brecon Beacons and Pembrokeshire Coast.
Few important names in slate are Jak Black, Silver Shine, Silver grey, Panther, Deoli Green, Peacock, Peacock Multi, Kund Black, Kund Multi, and so on. Being to some extent fragile in nature, it is good for interior use only and can be used in even as a washboard.
Examples of lithologies in the second sense include sandstone, slate, basalt, or limestone. [ 4 ] Lithology is the basis of subdividing rock sequences into individual lithostratigraphic units for the purposes of mapping and correlation between areas.
Slate – Metamorphic rock - A low grade metamorphic rock formed from shale or silt; 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
The Lesser Himalayas, to the north of the Damuda Belt contain Precambrian sedimentary rocks such as slate, dolomite and several kilometers of quartzite. "Slices" of basement granite and gneiss form mylonite at the edges. These rocks are believed to be part of the Indian Shield and are one billion years old.
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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.