A geode is a rounded rock with a hollow cavity that is filled with mineral deposits or crystals. They mostly occur in sedimentary or volcanic rocks. However, we can also make an imitation geode inside am egg!
What you need:
Raw eggs, Water, Alum powder, Glue, Paintbrush, Knife and Food colouring
What to do:
1. Gently tap one rounded end of the egg with a knife and remove its top.
2. Empty out the contents of the egg (omelette, anyone?) and wash the inside of the egg with water. Then rub the inside of the egg with your finger to remove the inner membrane.
3. Let the egg dry or pat it dry with a tissue. Then, using a paintbrush, line the inside of the egg evenly with glue.
4. Sprinkle a lot of alum powder inside the egg. Then turn the egg upside down to remove that powder which hasn’t got glued on.
5. Leave the egg overnight to de out completely.
6. The next day, heat a cup of water. Bring it to a boil and take it off the heat. Pour it into a bowl.
7. Add 30 to 40 drops of a food colouring of your choice. You can prepare different coloured solutions for different eggs, if you want. Stir well.
8. Then pour half a cup of alum powder into it (the ratio of water to alum is 2:1 i.e. for two cups of water, you need one cup of alum; for one cup, half the alum and so forth). Stir to mix well.
9. Then keep adding more alum until no more alum can dissolve into the water.
10. Now, gently place the dried eggshell (alum side up) into this solution and leave it overnight.
11. The next day, use a spoon to gently remove the egg from the solution and place it on a paper towel.
What happens:
Crystals have grown on the inside of the eggshell.
Why?
When you dissolved a lot of alum powder into the hot water, you created a super-saturated solution.
Picture Credit : Google
