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Sillar is a whitish volcanic stone from which many colonial buildings in the city of Arequipa, Peru, are made. A fine example are the Arcs of the "Mirador of Yanahuara" in Arequipa, from which the entire city can be appreciated.

The stone, a vapour-phase crystallized tuff produced by the now-extinct Chachani volcano during the Pleistocene era, was named by the geologist Clarence Fenner in 1948.

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