In general, mineral particles are small, having formed within confined areas such as lava flows or between grains of sediments. Large crystals found in geodes and other rocks are relatively rare.

Geodes typically have a hollow cavity lined with crystals. They form in sedimentary rocks like limestone, where mineral-rich water flows into cavities, depositing crystals over time. Thundereggs ...

Geodes are hollow rock formations that often contain crystals or mineral matter, and they are formed through various geological processes, including volcanic activity, sedimentation, and ...

During GEOfest, three museum floors are filled with vendors who educate visitors about various rocks, fossils and ... including minerals, geodes, jewelry and other related items.