Sunday April 20 2014
Egg Geodes


Growing crystals in an egg shell

Several people have written me lately, asking how to make simulated geodes in egg shells. Geodes are pockets of crystals that form in sedimentary and igneous rocks. They start as hollow spaces in rock that is porous enough for water to seep through. The water carries dissolved minerals, which are deposited in the open space, forming a lining of crystals. Most geodes contain quartz crystals, but they can also contain calcite, celestite, and other minerals.

Many rock shops and museum gift shops sell geodes that have been cut, and sometimes dyed to make them more colorful. Sometimes you can buy unbroken geodes, which lets you break them open yourself. That is particularly fun, as you never know how it will look until you open it.

If you don't have a place to collect geodes, you can make quick, easy, simulated geodes by using egg shells for the hollow spaces. I have seen several different recipes, many of which take days, but you can make an egg shell geode in a few hours by using epsom salts for the crystals. We will be using basically the same formula that we used for Growing Crystals from Solution, so you will need:





  • several egg shells, washed and cleaned
  • an egg carton to hold the shells
  • epsom salts, available at pharmacies and grocery stores
  • HOT water
  • a measuring cup
  • a refrigerator
  • food coloring

Start by making an omelet or something else yummy that requires eggs. For the best results, crack the eggs close to the small end of the egg. This leaves you a fairly large egg shell to use. The larger the egg shell, the more crystals you will have. Wash the shell, and remove the skin-like membrane that lines the shell. For short term projects, you can leave this membrane in place, but you should remove it if you plan to keep your geode for a long time, as the membrane tends to mold after a while.

Depending on how many eggs you are going to use, you may not need as much of the solution as we used before. I tried using 1/4 cup of epson salts and 1/4 cup of hot water, and it worked fairly well for 6 egg shells. You want the water to be hot, but not quite boiling. Stir in the epsom salts. If it all dissolves, add another spoon full. If that all dissolves, add some more. You want to reach the point where there are a few crystals that will not dissolve.

Place the egg shells in the egg carton, so they won't tip over and make a mess. Then pour the epson salt solution into the shells.

If you want brightly colored crystals, add a drop of food coloring. You might even try adding small drops of two or more colors to the same shell. Be sure to leave some of them uncolored, because I think the pure crystals are prettier than the colored ones.

Carefully place the egg carton into the refrigerator. Put it in a place where it will not be bumped or disturbed, and let it sit for at least 3 hours. That will give your crystals plenty of time to form.

Once you have plenty of crystals, remove the egg carton from the refrigerator. There will still be liquid in the shells, which you can carefully pour into the sink. Be careful not to let the crystals fall out of the shell as you drain them. Each shell should have a mass of needle-shaped crystals inside. As they dry, they will become even more bright and shiny.

Troubleshooting:

If you do not get crystals, then either your water was not hot enough, or you did not add enough epsom salts. The water should be very hot, so that it will dissolve a large amount of the epsom salts. Then keep adding the salts until no more will dissolve.


You can play with the concentration of the epson salts. Adding more epson salts to the water will give you a denser cluster of crystals, while adding a bit less will give you a better view of the individual crystals. If you used clean egg shells, your crystals should remain bright and shiny for weeks.

REALLY AWESOME!

This is a REALLY AWESOME project, thanks SO much for posting it!!!!!

(:

i started

i already put it in the frige a minit ago

i have to try!!!!!

I am going to try this experiment it sounds awsome

Getting Membrane Out

The "new" way to crack eggs is on a flat surface. This allows the shell to crack but the membrane to stay intact. For cooking, this is great because the pieces of shell stay out of your food. For this project, it should help by allowing the membrane to stay with the egg's contents when you empty it, saving you the "scraping" step.

is it supposed to be in the

is it supposed to be in the freezer or the bottom of the fridge?

Put it in the refrigerator,

Put it in the refrigerator, not the freezer.

hi

hi do you dedicate your life to your work

Try with alum

Google Egg geode and look for steps with ALUM. This makes amazing geodes and only takes 12/15 hours.

I need help

So, i did this for a science project. I did epsom salts in two eggs, sugar in the next two, and salt in the last two. I use this recipe but insted i did the math and did two teaspoons of each. I waited a day in the fridge and it came out as water...Im confused! did i do something wrong, and can you please help me!

What did you do wrong

well it certainly said to use Epsom salts. If you used Epsom salts then maybe the stuff wouldn't be water you should try it

For the salt and sugar, it

For the salt and sugar, it should come out as water. For the epsom salts, you should have gotten crystals. Be sure the water is hot enough, and that you are using equal amounts of water and epsom salts. If your epsom salts are large lumps, you may need to add a little extra, to make up for the open spaces between the lumps.

how long would it take

how long would it take because my science far project is in two weeks and i need to compare egg geodes to some thimg else what should it be.

This is super hard!

When you scrap the membrane it is so hard to get it all out. How do you get your membrane out without breaking the entire egg shell? I left them in the freezer for over 3 hours and they only look like ice-cubes. :( So, and oh yea I didnt get all the membrane out and it made the crystal look all white from the membrane and my project is due in 3 days!! Will I be able to fix them? Can I add food coloring to make the egg look like I got all the membrane out?

Question

How long dose it take

how long

It will take a week to be awesome

awsome

using it for my science fair with my best bud william! yea awesome test

....

The crystals didnt grow yet and it has been 2 days and it is still liquid.

question

Can you use cold water?

egg crystals

no u cant use cold water u must use warm water

No, cold water will not work

No, cold water will not work well. Hot water dissolves more of the Epsom salts, to make a supersaturated solution.

Can you do the expriment with

Can you do the expriment with the yolk and the white?

Is it possible to use a different container besides eggs?

I would love to try this but we are allergic to eggs. Can we use any other container perhaps a plastic Easter egg?

You can use a cup or anything

You can use a cup or anything it really doesnt matter if its an egg shell or not

I guess so!

I guess so!

Yes, you can use pretty much

Yes, you can use pretty much any container that will hold water. You could even try putting a nice rock into a glass, and then adding the epsom salt solution. You would probably get some pretty crystals growing on the rock.

Potassium Permanganate Crystals

Would this experiment work if we blew the egg out of the shell so that the shell was almost intact, and then used potassium permanganate to make the crytals? I'm thinking that if it did work it would look almost like an amythest geode.

I don't think potassium

I don't think potassium permanganate would recrystallize quickly, and grow large crystals. You would have better luck using potassium chromium alum for large, purple crystals.

Thank you for this. Can you

Thank you for this. Can you tell me where I'm likely to find potassium chromium alum? I'd like to give it a try.

Do a Google search for

Do a Google search for "Chromium Potassium Sulfate". You will find quite a few science supply and photographic supply companies that sell it.

Found this link

http://chemistry.about.com/od/growingcrystals/ht/blsugarcrystal.htm
This link shows how to make sugar crystals and has some special technique's and a video tutorial.

Thank you for this experiment. My son and I are looking forward to trying them both, the salt and the sugar crystals.

Is there a recipe out there

Is there a recipe out there where the crystals that form in the eggshell harden enough that you can peel the shell off and have the crystal formation stay intact?

I like it!

Is there a recipe somewhere where the crystals that form in the shell are sturdy enough that you can peel the shell off later and just have the hardened crystals?

I suspect that if you let

I suspect that if you let them dry for a few days, you would be able to remove the egg shell from these. I grew some in a plastic cup, and the clump of crystals came right out, and stayed bright and shiny for a couple of months. Eventually, they absorb enough humidity, and start to turn white. Then you just dissolve them, and grow more crystals.

how many days

How many days would it take for them to come out like that because, I have 3 days to scienefair and this is my project.

The crystals grow in just a

The crystals grow in just a few hours. Usually, science fair projects test an idea, so you might think about what you could test with this. For example, you might try using a different amount of epsom salts for each group, to see if the concentration makes a difference in crystal shape.

thanks man

thanks man by now i've made a pot with a sugar saturated solution and one with a salt saturated solution and the sugar isint doing anything!!!!!!! but the salt is sittig in pot just crystalating like crazy.Also i am going to sort of bribe the judges with homemade rock candy!!!!LOL!!!!

cooler

coolest experiment ever!!!
can we use sugar instead of epsom salts then eat the sugary ones?

Hmm. I've never tried it

Hmm. I've never tried it with sugar, but I will now. I suspect it would work with the right recipe.

Grownig Sugar Crystals

Hello Mr Krampf
I've grown some wonderful crystals using sugar!... and best of all you can eat them at the end!!

This trick is, is to let the mixture cool verrrrry slowly. So I used a vacuum flask to do it.
It took a week (well I left it for a week anyway) and the crystals were very large, like the size of one of your American Dime coins and long in length about 1 -2 inches and really thick, and perfectly angular like a rectangle but more beautiful.... i'd describe it as a glass gemstone.

You must try it!.... and then eat it!

Let me know if you need further details
Am.

Have you tried it yet?

I'm curious to know if you have tried to make the sugar crystals yet?
If so, how did they turn out?

Yes, and it works well.

Yes, and it works well. Watch the Igneous Sugar video , and use the same recipe.

Using Sugar

Hello
I've grown some wonderful crystals using sugar!... and best of all you can eat them at the end!!

This trick is, is to let the mixture cool verrrrry slowly. So I used a vacuum flask to do it.
It took a week (well I left it for a week anyway) and the crystals were very large, like the size of one of your American Dime coins and long in length about 1 -2 inches and really thick, and perfectly angular like a rectangle but more beautiful.... i'd describe it as a glass gemstone.

You must try it!.... and then eat it!

cool

That is the coolest experiment ever!!

Wow

I'm going to try this one for sure.

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