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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.
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
Metamorphic rocks are formed when existing rock is transformed physically or chemically at elevated temperature, without actually melting to any great degree. The importance of heating in the formation of metamorphic rock was first noted by the pioneering Scottish naturalist, James Hutton, who is often described as the father of modern geology ...
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.
Swithland gives its name to a line of 'slate' outcrops found along the east side of Charnwood, from Hallgates and Little John, through Swithland Wood and The Brand, up to Woodhouse Eaves. All these locations have old slate quarry pits, as does a corresponding outcrop on the other side of the Charnwood anticline at Groby. Swithland Wood had been ...
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.
Slate has been quarried in north Wales for almost two millennia with the Segontium Roman fort at Caernarfon being roofed by local slate in the late second century. Export of slate has been carried out for several centuries, which was recently confirmed by the discovery in the Menai Strait of the wreck of a 16th-century wooden ship carrying finished slates.
A quarry is not a short-term project unless it encounters one of these constraints. Examples of big, old quarries operating for more than a century include the Barre (VT) granite quarry, the Georgia Marble quarry at Tate, several of the Carrara (Italy) marble quarries, and the Penrhyn (Wales) slate quarry.