rhyolite: Quick Facts

Written and fact-checked by

The Information Architects of Encyclopaedia Britannica

Photos

Bowen's reaction series

See All Images →

Topics

pantellerite felsic and mafic rocks extrusive rock granite pumice basalt perlite trachyte obsidian phonolite diabase andesite pitchstone

Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.

(Bed) Rocks and (Flint) Stones