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Granite (/ ˈ ɡ r æ n ɪ t / GRAN-it) is a coarse-grained intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous ...
Ballyknockan quarry, or more correctly Ballyknockan quarries, [4] are a collection of disused granite quarries in the village of Ballyknockan, County Wicklow, Ireland. [5] [1] [6] From the early 19th century onward, the site was "probably the most important area for supplying cut stone blocks of granite for the construction of many of Dublin city's major public buildings", according to a ...
The granite consists of two main types, coarse-grained granite with abundant large alkali feldspar megacrysts and coarse-grained granite with few megacrysts. To the southwest there is an area of coarse-grained granite with small megacrysts and several small exposures of fine-grained granite, particularly in the southeastern part of the outcrop ...
However, Kronborg was built with solid granite and had a double defensive ring, with the inner one having four bastions and a moat, also being stocked with large amounts of provisions, ammunition, and artillery, of which there were over 90 guns. [5] Portrait of Dahlbergh by David Klöcker Ehrenstrahl
Gabbro is known in the construction industry by the trade name of black granite. [31] However, gabbro is hard and difficult to work, which limits its use. [32] The term "indigo gabbro" is used as a common name for a mineralogically complex rock type often found in mottled tones of black and lilac-grey.
Granite forms deep in the Earth's crust under conditions of high ambient or lithostatic pressure. In order for the granite to be exposed at the Earth's surface a considerable thickness of rock must be eroded. This unloading allows the granite to expand radially and sheet fractures form tangentially to the radial stress. This indicates that the ...
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The unfinished obelisk is the largest known ancient obelisk [citation needed] and is located in the northern region of the stone quarries of ancient Egypt in Aswan, Egypt.It was studied in detail by Reginald Engelbach in 1922.