If you have discovered a geode (a rounded cavity rock formation lined with crystals inside), we recommend that you open it carefully and as safely as possible. Each geode is unique, and can contain various types of crystals, from pure quartz to rich purple crystals of amethyst, agate, chalcedony, or minerals such as dolomite. Fortunately, there are several ways to open a geode.
Steps
Step 1. Before attempting to open a geode, wear safety glasses
Method 1 of 5: Using the Hammer
Step 1. Insert the geode into a sock and place it on the ground
Step 2. Get a small sledgehammer or rock hammer (preferably not a construction hammer, such as a carpenter's hammer), and hit the top center of the geode
It may take a couple of hits to open the rock in two. The blows could cause the geode to fragment into more than two pieces, but it is the most suitable method for children, although not recommended for particularly rare or valuable geodes.
Method 2 of 5: Using the Chisel
Step 1. Get a rock or mason chisel, and place it high in the center of the rock
Now, with the hammer in the other hand, tap it lightly, simply to scratch the rock with an incision.
Step 2. Rotate the rock a little, then hit it again
The intent, in this case, is to create a line of small incisions around the circumference of the stone.
Step 3. Repeat as necessary until the rock breaks
Patience is everything. If the geode is hollow, it will probably take a few minutes of light tapping to open it; if instead the geode is solid, it will take a little longer.
Method 3 of 5: Using a Dry Shot
Step 1. Hit the geode with another larger geode
This method only works if you have good rock control in the palm of your hand. Use this method only for small geodes (such as a golf ball).
Method 4 of 5: Chain Pipe Cutter for Cast Iron Pipes
Step 1. Use a chain pipe cutter for cast iron pipes
This common plumber's tool can help you split a geode symmetrically - that is, into two equal parts. Wrap the tool chain around the geode.
Step 2. Insert the chain into the tool, tightening it tightly around the geode
Step 3. Lower the handle to apply even tension around the rock
It should break easily (this is the least destructive method of viewing a geode in its natural form).
Method 5 of 5: Using a Diamond Blade
Step 1. Use a diamond-tipped saw to cut the geode into two equal halves (note that oil can damage the inside of some geodes)
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Advice
- If the geodes make noise when they are shaken, it means that there may be fully formed loose crystals, such as quartz, inside the cavity.
- For best results when opening the door, place the geode on a larger rock at ground level, or on sand (never on wood, such as a picnic table or parquet).
- Sometimes the smaller geodes can be solid inside, but they are still attractive; they too can be lined internally with splendid agate rings.
