Cerro Cebollar is a 5,716-metre-high (18,753 ft) volcano in Antofagasta Region, Chile including andesitic-dacitic irregular lava flows.
They contain 61.7–61.8% SiO2; the volcano itself is a few million years old judging by its appearance.
It is covered by a rhyolitic pumice coming from a neighbouring caldera.
[1] It is part of the Cerro de las Cuevas-Cerro Palpana volcanic chain.
[2] This volcanology article is a stub.