You are here


Rocks: geodes

Break open geodes to find the crystals inside.
Science content (2016 curriculum): 
Chemistry: Crystals (7)
Earth/Space: Rock cycle, Earth Materials, Natural resources (5)
Lessons activity is in: 
  • geodes. Note that some are much better quality than others
  • hammer
  • old chisel if the geodes need to be opened cleanly
  • old sock

To break the geodes into many pieces, put one in a sock and hit it with a hammer. This will make many small pieces, that can be shared among students.

If there are more geodes available, and each student can take home a larger piece, you can try to break the geodes open by breaking them into just two or three pieces using the chisel and hammer.

Grades taught: 
Gr 1
Gr 2
Teaching site: 
After School Program at Elementary schools in New York City