Do you know Volcanic Breccia?

Volcanic Breccia is a unique extrusive igneous rock that is has large, angular fragments stuck in a fine-grained rock background. This rock forms during an eruption when when rock fragments are plucked off of the inside wall of the volcano and are stuck in the lava, or when rock fragments are picked up from the ground by flowing lava.  The rocks fragments become stuck in the lava and become part of the larger rock.

Visit Mini Me Geology where you can find volcanic breccia as an individual sample as well as a part of our My Rockin Collection Deluxe Igneous Rock Kit, our Junior Igneous Rock kit, and in our Igneous Investigation Rock Detectives kit.

Volcanic Breccia Trivia!

  • Since the types of rocks in and around a volcano can vary, the minerals that are contained in volcanic breccia can be different between samples.
  • Conglomerate rocks are often confused with volcanic breccia.  However, volcanic breccia has angular rock fragments and conglomerate has round rock fragments.

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