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Download e-book for iPad: Britannica Illustrated Science Library Rocks And Minerals by Inc. Encyclopaedia Britannica

By Inc. Encyclopaedia Britannica

ISBN-10: 1593397992

ISBN-13: 9781593397999

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Sandstones are classified according to their mineral composition, their level of complexity (or geologic history), and the proportion of cementation material they contain. Quartzarenite (which is more than 95 percent quartz), arkose (which is mostly feldspar), red sandstone (which is cemented by iron compounds), and graywacke belong to this class of rocks. ARKOSE possesses a varied composition, although it contains up to 25 percent quartz and feldspar. Generally, it has a porous consistency, and less than one percent of its interstices are empty.

Sandstones are classified according to their mineral composition, their level of complexity (or geologic history), and the proportion of cementation material they contain. Quartzarenite (which is more than 95 percent quartz), arkose (which is mostly feldspar), red sandstone (which is cemented by iron compounds), and graywacke belong to this class of rocks. ARKOSE possesses a varied composition, although it contains up to 25 percent quartz and feldspar. Generally, it has a porous consistency, and less than one percent of its interstices are empty.

On the rock are forms such as Kuniya women and the wounded head of the Liru warrior, among others. ULURU-KATA TJUTA NATIONAL PARK, Australia Latitude 25° S Longitude 131° E The great reddish rock of Uluru was created during the Alice Springs orogeny, 400 million years ago. The sandstone and conglomerates that formed the ancient alluvial fans folded and fractured deeply, turning horizontal layers on their ends. CAVE PAINTINGS Uluru contains some of the most representative features of the ancestral history of the Aborigines.

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Britannica Illustrated Science Library Rocks And Minerals by Inc. Encyclopaedia Britannica


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