noun
- a rounded rock containing a hollow cavity lined with crystals or mineral matter
Usage: geology
Examples
- The children were excited to crack open the geode and see the purple crystals inside.
- She collected geodes from the riverbed during her geology field trip.
- The museum displayed a large geode split in half to show its amethyst interior.
- Geodes form when mineral-rich water fills cavities in volcanic or sedimentary rock.
- The gift shop sold small geodes that visitors could break open themselves.
- His rock collection included several beautiful geodes with quartz crystals.