Scoria is a red, brown or black extrusive igneous rock that has a vesicular texture, which means that it has holes throughout the rock. This rock is often called “lava rock” and is popular as landscape mulch. Scoria forms outside of the volcano when the lava flow becomes frothy on top then cools quickly. The gasses in the lava expand and escape forming air hole or vesicles in rock. Unlike pumice, scoria rocks will not float.

An information card with details on the rock formation, mineral content, characteristics, and uses is included. Typical samples sizes are generally 1-2 inches in length or width but can vary based on availability and natural formation.

Safety Warnings

WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 years.
May have sharp edges.