Rock Topics

Common Igneous Rocks (Part 7)


Tuff is an igneous rock with pyroclastic texture.  Tuffs consist of fine-grained fragments created during volcanic eruptions.  Some larger fragments are visible in this specimen.

Tuff (Photograph by Parvinder Sethi)

Volcanic Breccia

Volcanic breccia is an igneous rock with large, angular fragments of volcanic material.  This breccia probably formed during a violent volcanic eruption.

BrecciaVolcanic breccia (Photograph by Parvinder Sethi)