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O Gnaisse Facoidal: a mais Carioca das Rochas.

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Author(s): Kátia Leite Mansur | Ismar Souza Carvalho | Carlos Fernando Moura Delphim | Emilio Velloso Barroso

Journal: Anuário do Instituto de Geociências
ISSN 0101-9759

Volume: 31;
Issue: 2;
Start page: 9;
Date: 2008;
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Keywords: Augen Gneiss | Cultural Landscape | Geological Heritage

ABSTRACT
The city of Rio de Janeiro is known by its natural beauties. The mountains and the sea make the city the postcard ofBrazil. The sculpture of the carioca landscape is closely related to the augen gneiss, very resistant rock to the weatheringand, for this reason, it stands out in the relief. It gives form for Sugar Loaf and Corcovado, for example. Augen gneisswas used in the construction of most of the historical buildings of the city, including museums and churches, manyof them were built in the 19th century. It was used in the sculpture of ornaments, facades and frames of doors andwindows. The exploitation of the augen gneiss was presented by Jean Baptiste Debret in his book "Voyage Pittoresque etHistorique au Brésil". A picture of quarry is presented at Morro da Glória and describes the extraction method by slavelabor. He informes that the augen gneiss is softer, less expensive and more easily exploited. It was destined, mainly, tothe parts of the buildings that should be sculpted. This rock is still present in an important event of the history of thebrazilian arts. Pedra do Sal, a stairway sculpted in the augen gneiss Downtown, was the place that African people metin the past to tell their histories, to do religious cults and to sing. In these meetings in Pedra do Sal samba was born.
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