The orthoquartzite has been proposed for nomination to the Global Heritage Stone Resource.
2.
The conglomerates are primarily orthoquartzite monomict vein-pebble conglomerates, or polymict pebble conglomerates.
3.
Orthoquartzite is a very pure quartz sandstone composed of usually well-rounded quartz grains cemented by silica.
4.
In some regions of Argentina, the orthoquartzite-stoned facade is one of the main features of the Mar del Plata style bungalows.
5.
Its oldest exposed rocks are from the Clark Group, of pelitic rocks, some with stromatolites, and evaporites, and overlaid with orthoquartzite.
6.
Orthoquartzite is often 99 % SiO 2 with only very minor amounts of iron oxide and trace resistant minerals such as zircon, rutile and magnetite.
7.
The Silver Mound Archaeological District, Wisconsin preserves the remains of a complex of quarry pits and associated lithic workshops where Native Americans mined Hixton Orthoquartzite over several millennia.
8.
A type of pure quartz sandstone, the orthoquartzite, with more of 90 95 percent of quartz, has been proposed for nomination to the Global Heritage Stone Resource.
9.
The orthoquartzite is also known in Argentina as " Piedra Mar del Plata " ( Mar del Plata stone ), both because its use on the houses of this style and the abundance of sandstone quarries southwest of the city.
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