Hornfels is a fine-grained metamorphic rock that can range from dark to light in color. The original rock type was typically sandstone, clay or shale, limestone, or diabase.
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.