Andesite is an igneous rock that consists of mostly feldspar and biotite. This rock is usually gray, brown, black, reddish-pink or green. Andesite is often associated with formations of volcanic ash or tuff rock.
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.
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 years.
May have sharp edges.