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Quartzite. Quartzite is a hard, non- foliated metamorphic rock which was originally pure quartz sandstone. [1][2] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts. Pure quartzite is usually white to grey, though quartzites often occur in various shades of pink and ...
Aventurine. Aventurine is used for a number of applications, including landscape stone, building stone, aquaria, monuments, and jewelry. Aventurine is a form of quartzite, characterised by its translucency and the presence of platy mineral inclusions that give it a shimmering or glistening effect termed aventurescence.
The geology of Vietnam is divided into five structural blocks : Northeast (NE), Northwest (NW), Truongson, Kon Tum and Nambo. The NE block is a part of the South China plate, in which strata and igneous rocks have been found dating from the Early Paleozoic to the Quaternary. The NW and Truongson blocks are regarded as NW-SE trending Paleozoic ...
Sioux Quartzite at Falls Park, Sioux Falls, South Dakota Cross-bedding in the Sioux Quartzite, Blue Mounds State Park, Minnesota, United States.. The Sioux Quartzite is a Proterozoic quartzite that is found in the region around the intersection of Minnesota, South Dakota, and Iowa, and correlates with other rock units throughout the upper midwestern and southwestern United States.
Gành Đá Đĩa. The basalt rocks. Gành Đá Đĩa or Ghềnh Đá Đĩa (literally means The Sea Cliff of Stone Plates) is a seashore area of uniformly interlocking basalt rock columns located along the coast in An Ninh Dong Commune, Tuy An District, Phu Yen Province, Vietnam . The area is about 100 meters wide and 250 meters long, composed ...
Hạ Long Bay is located in northeastern Vietnam, from E106°55' to E107°37' and from N20°43' to N21°09'. The bay stretches from Quang Yen town, past Hạ Long city, Cẩm Phả city to Vân Đồn District, is bordered on the south and southeast by Lan Ha Bay, on the north by Hạ Long city, and on the west by Bai Tu Long Bay.
[7]: 90–3 The area was used as a transit route for men and supplies destined for the Viet Cong insurgency in South Vietnam which became known as the Ho Chi Minh Trail. In September 1959, North Vietnam formed Group 959 in Laos with the aim of securing the supply route to South Vietnam and building the Pathet Lao into a stronger counterforce ...
Quartz arenite makes up the Prospect Mountain Quartzite on top of Doso Doyabi, Nevada. A quartz arenite or quartzarenite is a sandstone composed of greater than 90% detrital quartz. [1] Quartz arenites are the most mature sedimentary rocks possible, and are often referred to as ultra- or super-mature, and are usually cemented by silica. They ...