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Trachyte (4)

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Trachyte is an extrusive igneous rock composed mostly of alkali feldspar. It is usually light-colored and aphanitic (fine-grained), with minor amounts of mafic minerals, and is formed by the rapid cooling of lava enriched with silica and alkali metals. It is the volcanic equivalent of syenite. Trachyte is common wherever alkali magma is erupted, including in late stages of ocean island volcanism and in continental rift valleys, above mantle plumes, and in areas of back-arc extension. Trachyte has also been found in Gale crater on Mars. Trachyte has been used as decorative building stone and was extensively used as dimension stone in the Roman Empire and the Republic of Venice.

Trachyte - Wikipedia

Showing Data Points related to the Word Trachyte

Data Points with Word "Trachyte"

Seopseom, Munseom and Beomseom are islands formed about 500,000 years ago wih the trachyte, not with the basalt, basic rock of Jeju Island. They have unusual rock formations and caves formed by the erosion of the sea, which make for breathtaking scenery. Seopseom is off the shores of Bomok-dong with 142,612 meters squared land area and 159.5 meters above the sea level. It is called 'Seopseom' because it has a great deal of trees, and also commonly called 'Seolpiseom'. The whole island is designated as Natural Monument No. 18. A natural habitat of spleenwort (asplenuim antiguum makino) of Samdo, and also the native place of Citrus Tachibana (Makino) C. Tanaka. The warm ocean currents that flow up from the south along the coastline of Seogwipo have led to the creation of natural habitats for numerous exotic or rare species. The warm, clean waters also help create and preserve unique seascapes - represented by the three small islands of Seopseom, Munseom and Beomseom - in the waters around Seogwipo. Of the three, Seopseom Island is famous for its natural habitat of spleenworts, which has been designated by the Korean governemtn as Natural Monument No 18, while the other two islands have been turned into a nature reserve to protect their rare flora and fauna, and designated as Natural Monument No. 421. Seopseom, the island on the left when viewed from the coast, also known by the names Seolpiseom (lit. 'Firewood Island') and Samdo (lit. 'Cedar Island'), is a natural habitat for a rare plant species called spleenwort. The island in the middle is Munseom (lit. 'Bald Island') because no plants can grow there properly. The island is loved for its scenic rocky cliffs that drop vertically into the sea and the great underwater views created by coral and other exotic marine life forms.

Beomseom looks like a tiger, so it gets its name from that. Its land area is 93,597 square meters and it is 87.2m above sea level. It is designated as Natural Monument No 421, and it is the southernmost area where Japanese (black) wood pigeons (Natural Monument No. 215) breed and inhabit. Various kinds of marine lives worth of researching inhabit around the island. Especially a number of marine lives of new or unrecorded species appear, grow and inhabit around the island so that it could be a representative area of the variety of life in the south. Also the island is a treasure house of marine resources with gathering of coral around the island. Seopseom, Munseom and Beomseom are islands formed about 500.000 years ago with the trachyte, not with the basalt, basic rock of Jeju island. They have unusual rock formations and caves formed by the erosion of the sea, which make for breathtaking scenery. The island on the right is named Beomseom (lit. 'Tiger Island') as it is said to resemble a tiger. It has two shallow caves formed by waves just above sea level, which are called 'Kotgumeong' (lit 'Nostrils') because they look like the nostrils of a tiger. Beomseom Island also provides natural habitats for several rare plant and bird species including the Korean wood pigeon, which has been designated as Natural Monument No. 215 by the Korean government. The island is also associated with the great victory of General Choe Yeong (1316-1388) in the battle waged around the island against the Mongol forces that invaded Korea (then Goryeo) in 1374.

Munseom means a bare island where nothing grows. Its land area is 96,833 square meters and it is 85.7m above sea level. It is designated as Natural Monument No 421, 'Munseom Island and Beomseom Island nature reserve' along with Beomseom Island. There are coral habitats around the island. Seopseom, Munseom, and Beomseom are islands formed about 500,000 years ago with the trachyte, not with the basalt, basic rock of Jeju island. They have unusual rock formations and caves formed by the erosion of the sea, which make for breathtaking scenery. The island in the middle is Munseom (lit. 'Bald Island') because no plants can grow there properly. The island is loved for its scenic rocky cliffs that drop vertically into the sea and the great underwater views created by coral and other exotic marine life forms. 

It is named after its peculiar appearance which looks like wrinkles on the forehead of an old man, it is 200m high, consisting of trachyte that is emplaced as magma conduit with numerous horizontal joints. Trachyte with high viscosity became resistant to erosion, forming a steeper peak relative to its surroundings. The formation process of Noinbong is trachyte lava cooled to form a kind of lava dome as it ascends through the volcano conduit with intrusion into the basaltic agglomerate becoming extinct.

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