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1) "Slate" -- As to slate quarry 1slate Pronunciation: 'slAt Function: noun Etymology: Middle English sclate, slate, from Anglo-French *esclat, from esclater to splinter, break off, of Germanic origin; akin to Old High German zesleizzen, slIzan to tear apart -- more at SLIT 1 : a piece of construction material (as laminated rock) prepared as a shingle for roofing and siding 2 : a dense fine-grained metamorphic rock produced by the compression of various sediments (as clay or shale) so as to develop a characteristic cleavage 3 : a tablet (as of slate) used for writing on 4 a : a written or unwritten record (as of deeds) <started with a clean slate> b : a list of candidates for nomination or election 5 a : a dark purplish gray b : any of various grays similar in color to common roofing slates - slate adjective - slate·like /-"lIk/ adjective Pronunciation Symbols Slate Thick slate fragment Slate roof Slate is a fine-grained, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low grade regional metamorphism. The result is a foliated rock in which the foliation may not correspond to the original sedimentary layering. - 1 Chemical composition
- 2 Uses of slate
- 3 Slate extraction
- 4 See also
- 5 External links
| Slate is mainly composed of quartz and muscovite or illite, often along with biotite, chlorite, hematite, and pyrite along with, less frequently, apatite, graphite, kaolin, magnetite, tourmaline, or zircon as well as feldspar. Occasionally, as in the purple slates of North Wales, ferrous reduction spheres form around iron nucelei, leaving a light green spotted texture - the spheres sometimes deformed by a subsequent applied stress field to ovoids, which appear as ellipses when viewed on a cleavage plane of the specimen. Slate can be made into roofing slates, also called roofing shingles, because it has two lines of breakability: cleavage and grain. This makes it possible to split slate into thin sheets. Fine slate can also be used as a whetstone to hone knives. Due to its thermal stability and chemical inertness, slate has been used for laboratory bench tops and for billiard table tops. In 18th and 19th century schools, slate was extensively used for blackboards and individual writing slates for which slate pencils were used. Slate tiles are often used for interior and exterior flooring or wall cladding. Tiles are installed and set on mortar and grouted along the edges. Chemical sealants are often used on tiles to improve durabi..."
2) "Quarry" -- As to slate quarry 1quar·ry Pronunciation: 'kwor-E, 'kwär- Function: noun Inflected Form(s): plural quarries Etymology: Middle English quirre, querre entrails of game given to the hounds, from Anglo-French cureie, quereie, from quir, cuir skin, hide (on which the entrails were placed), from Latin corium -- more at CUIRASS 1 obsolete : a heap of the game killed in a hunt 2 : GAME; specifically : game hunted with hawks 3 : one that is sought or pursued : PREY Pronunciation Symbols A small cinder quarry A dimension stone quarry An abandoned limestone quarry Coquina Quarry Sixty feet below sea level Conway, South Carolina A quarry is a type of open-pit mine from which rock or minerals are extracted. Quarries are generally used for extracting building materials, such as dimension stone. Quarries are usually shallower than other types of open-pit mines. People in some English-speaking countries are unlikely to make the distinction between this type of mine and any other type of open-pit or open-cast borrow or gravel pit mining operation. Quarries in level areas often have special engineering problems for drainage. The coquina quarry at the right is excavated to more than sixty feet (18 meters) below sea level. To reduce surface leakage a moat, lined with clay, was constructed around the entire quarry. Ground water that seeps into the pit is pumped up into the moat. Many quarries fill with water to become ponds or small lakes after abandonment for mining purposes. Others have become landfills. - 1 Quarry Swimming
- 2 References
- 3 External links
- 4 See also
| Water-filled quarries can be very deep with water, often 50 feet or more, that is often surprisingly cold. Unexpectedly cold water can cause a swimmer's muscles to suddenly weaken; it can also cause shock and even hypothermia[1]. Though quarry water is often very clear, submerged quarry stones and abandoned equipment make diving into these quarries extremely dangerous. Several teenagers and young men and women drown in quarries each year [2][3]<..."
Further Data On Term for slate quarry
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