Therefore, the crystals nearest the center are the last to form. The crystalline material is usually harder than the host rock. Over time, the host rock erodes leaving behind the geodes. Typical minerals found in geodes include quartz and chalcedony, calcite, and selenite. Many other minerals can also be found including marcasite, pyrite, barite, strontianite, goethite, and kaohnite.
Geodes are unique forms of nature, and like fingerprints, no two are exactly alike.
We have a variety of different geode Gift Crates available. See the individual description for each size of crate to see the types and sizes of geodes included. These geodes were found near the famous Coconut Geode beds of Mexico which produce the beautiful Amethyst Geodes. We have purchased the entire lot of these large geodes from the mine at a very good price. These geodes will probably contain clear quartz or calcite crystals and some may even contain Amethyst.