A geode is a round rock which contains a hollow cavity lined with crystals. Rocks which are completely filled with small compact crystal formations such as agate, jasper or chalcedony are called nodules. The only difference between a geode and a nodule is that a geode has a hollow cavity, and a nodule is solid. This piece of Original Resin and crystal Wall Art is made with real amethyst crystals, pigments, acrylic paints, glitter, and intricately layered with epoxy resin on canvas. It is ready to hang with the hook on the back. The design is based on an amethyst agate slice.