Igneous rock

Rhyolite

Felsic, extrusive and fine-grained (aphanitic), often tan or pinkish. Can be porphyritic with quartz and potassium feldspar phenocrysts.

Equivalent: Granite is its intrusive equivalent.

**Porphyritic rhyolite, Yellowstone.** Wikimedia Commons (author and license on the file page). Source

**Flow-banded rhyolite, Corsica.** Wikimedia Commons (author and license on the file page). Source

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More photos and thin sections

Alex Strekeisen: Rhyolite (thin sections)

Other igneous rocks

Granite · Diorite · Gabbro · Peridotite and dunite · Andesite · Basalt · Komatiite · Obsidian, pumice and scoria

Sources

Panchuk, Physical Geology 7.3: Classification of Igneous Rocks