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Slate is a fine-grained, metamorphic rock that shows no obvious compositional layering but can easily be split into thin slabs and plates. [2] [3] It is usually formed by low-grade regional metamorphism of mudrock.
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.
The world's biggest consumer of slate is France, followed by the UK, USA and Germany. In 2012, Spain produced more than 580,000 tonnes (570,000 long tons; 640,000 short tons) of slate worth about $380 million. This made it the largest slate producer in the world, followed by China and Brazil. [3]
Dutchess Quarry Cave Site, Goshen, NY, NRHP-listed, "in the Town of Goshen in Orange County, New York. It is midway between the village of Goshen and Florida, at the junction of NY 17A and Quarry Road (Orange County Route 68), built into the side of a 580-foot (177 m) hill known as Mount Lookout.
Stone slab. Heavy stone slabs (not to be confused with slate) 1–2 inches thick were formerly used as roofing tiles in some regions in England, the Alps, and Scandinavia. Stone slabs require a very heavyweight roof structure, but their weight makes them stormproof. An obsolete roofing material, now used commercially only for building restoration.
The bridge carrying the slate tramway over the Canal at Pentrefelin c1895. The tramway was designed by Henry Dennis for John Taylor & Son (owner of the slate and slab mill) around the time the slate and slab mill was built. This involved laying tracks either side of the canal at the slate wharves with a lifting bridge to allow the line to cross ...
Flexible stone veneer is made from a thin layer of stone stripped or peeled from a metamorphic stone marble chips or slab, rather than cutting from a solid stone or precast composite material. Thin veneers (from .5mm to 2mm thick) of slate, schist, or sandstone ( metamorphic rocks ) are pulled away from the original thicker stone slabs by ...
Gore Mountain Garnet, found in the Adirondack Mountains in New York, contains the world's largest garnets. [1] [2] The rock that holds these garnets, garnet amphibolite, is sometimes referred to as 'black ore' or 'dark ore.' [1] [3] This rock formation formed during metamorphism during the Ottawan phase of the Grenvillian orogeny, and extremely high temperatures combined with introduction of ...