Younker, Leland W. Earth Sciences Department, Lawrence Livermore National Laboratory, University of California, Livermore, California.
Last reviewed:December 2019
- Structure and eruptive style
- Composition, mineralogy and texture
- Occurrence and origin
- Research drilling
- Related Primary Literature
- Additional Reading
A very light-colored, aphanitic (not visibly crystalline), volcanic rock that is rich in silica and broadly equivalent to granite in composition. Migration of rhyolitic magma through the Earth's crust, which causes much of the Earth's explosive and hazardous volcanic activity, represents a major process of chemical fractionation by which continental crust grows and evolves. See also: Granite
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