Rhyolite

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Volcanic rock (or lava) that characteristically is light in color, contains 69 percent silica or more, and is rich in potassium and sodium. [1]

Rhyolite is a light-colored rock with silica (SiO2) content greater than about 68 weight percent. Sodium and potassium oxides both can reach about 5 weight percent. Common mineral types include quartz, feldspar and biotite and are often found in a glassy matrix. Rhyolite is erupted at temperatures of 700 to 850° C. [2]

References

  1. Glossary of Volcano and Related Terminology (Foxworthy and Hill, 1982)
  2. Glossary of Volcano and Related Terminology (USGS/VHP)