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Rhyolite caldera complexes are the most explosive of Earth's volcanoes but often don't even look like volcanoes. They are usually so explosive when they erupt that they end up collapsing in on themselves rather than building any tall structure (George Walker has termed such structures inverse volcanoes).
*Some rhyolite during early stage of rifting when continental crust is still thicker and basaltic magma plumes become enriched in silica as they ascend to the surface. Light colored flows of rhyolite with pumice and obsidian.