Four rough stones ready to tumble! Each stone is approximately 1 inch. Sodalite has a Mohs hardness scale of 5.5-6.
Sodalite is a blue mineral high in sodium content, found in different spots around the world in igneous and metamorphic rock. It can fluoresce under UV light.
A perfect gift for the rock hound in your life. If they don't already have a rock tumbler, you're in the right place. The Science Museum of Minnesota also sells tumbling supplies and equipment.
