Candy Geode Recipe

Candy Geode

Crystallized sugar forms the crystals in this candy geode.
Crystallized sugar forms the crystals in this candy geode. | Source

Geode Candy

Geodes are crystal-filled, hollow rocks. Many rock collectors, children, and geologists delight in finding geodes, which form from gas bubbles in sedimentary rock or in volcanic rock. In the United States, they are most commonly found in the states of Utah, Missouri, Iowa, Indiana, and Kentucky.

Geodes can be hard to find, but simulated geodes are simple to make. This recipe is for an entirely edible geode, made from sugar crystals and chocolate. This candy would be a fun treat at a gem-themed birthday party, science class, or to simply surprise a rock-hound!

Be sure to plan ahead when making candy geodes: the sugar crystals take 2 days to form, so the candy must be made in advance. Make sure you have a space cleared out in a dark cupboard, so the sugar syrup solution has a place to sit, undisturbed, for a full 48 hours. In some cases, the crystals may take more than 48 hours to form.


Sugar Crystal Ingredients

Click thumbnail to view full-size
Make an easy recipe for sugar crystals by creating a super-saturated sugar solution.Add the sugar to boiling water, and stir until the sugar is dissolved.Add food coloring to tint the syrup, if desired. For the purple geode, 10 drops of blue food coloring and 10 drops of red food coloring were added to the syrup.Mix the food coloring until it creates an even color.
Make an easy recipe for sugar crystals by creating a super-saturated sugar solution.
Make an easy recipe for sugar crystals by creating a super-saturated sugar solution. | Source
Add the sugar to boiling water, and stir until the sugar is dissolved.
Add the sugar to boiling water, and stir until the sugar is dissolved. | Source
Add food coloring to tint the syrup, if desired. For the purple geode, 10 drops of blue food coloring and 10 drops of red food coloring were added to the syrup.
Add food coloring to tint the syrup, if desired. For the purple geode, 10 drops of blue food coloring and 10 drops of red food coloring were added to the syrup. | Source
Mix the food coloring until it creates an even color.
Mix the food coloring until it creates an even color. | Source

Ingredients

  • 2 cups water
  • 4 cups sugar
  • food coloring
  • 1 bag white candy melts
  • 2 tbsp unsweetened cocoa powder
  • cooking spray
  • aluminum foil
  • small bowls
  • plastic wrap

Rock Candy Geode Video

How to Make Sugar Crystals (Rock Candy)

The edible crystals inside of the candy geode are made from sugar. As with any other "rock candy" recipe, twice as much sugar as water is required. This recipe will require:

  • 2 cups of water
  • 4 cups of sugar
  • Food coloring (optional)

While food coloring is not required for the recipe, it is highly recommended to create colorful, bright crystals that resemble amethyst and other crystals found in real geodes.

  1. Add 2 cups of water to medium saucepan. Bring the water to a boil.
  2. Add the sugar, one cup at a time. Stir the sugar until it is dissolved.
  3. Remove the syrup from its heat source, and stir in food coloring, if desired.

If several different colors are desired, pour the syrup into 3-4 bowls and add food coloring to each bowl. Tint each bowl of syrup until it is quite dark, as the final crystals will be lighter in color than the wet solution.

Candy Geode Crystals

Click thumbnail to view full-size
Line small bowls with aluminum foil and spray the aluminum lining with cooking spray.Pour the tinted syrup into the foil-lined bowls.Place the syrup-filled bowls into a dark cupboard and do not disturb. Allow to sit for 48 hours, or until a thick layer of crystals form.
Line small bowls with aluminum foil and spray the aluminum lining with cooking spray.
Line small bowls with aluminum foil and spray the aluminum lining with cooking spray. | Source
Pour the tinted syrup into the foil-lined bowls.
Pour the tinted syrup into the foil-lined bowls. | Source
Place the syrup-filled bowls into a dark cupboard and do not disturb. Allow to sit for 48 hours, or until a thick layer of crystals form.
Place the syrup-filled bowls into a dark cupboard and do not disturb. Allow to sit for 48 hours, or until a thick layer of crystals form. | Source

Forming the Geode Crystals

The sugar syrup must be poured into foil-lined bowls to create the crystalline interior of the candy geode. For this step in the process, you will need:

  • Small bowls (12 "prep" bowls were used for this recipe)
  • Aluminum foil
  • Cooking spray
  • Simple sugar syrup
  • A dark cupboard

Cut the aluminum foil into squares that will fit inside each bowl. Press the foil into the bowls to create a liner. Spray each foil-lined bowl with cooking spray.

Pour the super-saturated sugar syrup into each bowl. Place the filled bowls into a dark cupboard and allow the solution to sit for 48 hours (2 full days).

Why the Crystals are Made First

Some people might think it would be easier to make the chocolate shell first - why not simply pour the sugar syrup into a pre-formed chocolate shell? At first glance, this appears to be a time-saving measure. Unfortunately, pouring the liquid syrup into a chocolate shell simply won't work: the syrup will dissolve the chocolate! The candy crystals must be made first, and the shell applied after the crystals have dried.

How to Make a Chocolate Geode "Shell"

  1. After 48 hours have passed, remove the sugar solution from the dark cupboard. Pour off the excess fluid. Gently peel the aluminum foil off the sugar crystal form.
  2. Next, melt white chocolate candy pieces in the microwave. Microwave the candy melts in short bursts, 10 to 20 seconds at a time, stirring frequently.
  3. Turn the crystal geode form upside down on a piece of wax paper. Use a paintbrush or a butter knife to gently coat the back of the crystal form in white chocolate. Allow the white chocolate layer to dry.
  4. Add a tablespoon or two of dry, unsweetened cocoa powder to the melted white candy pieces. Adjust the amount of cocoa powder to achieve a brown color.
  5. Paint the brown chocolate layer over the white chocolate layer. Allow the chocolate to dry.
  6. Trim the edges of the chocolate layers with a serrated knife to form an even edge.


Adding the Chocolate Shell Layers

Click thumbnail to view full-size
Pour off the excess liquid from the crystallized sugar.Remove the candy from the bowls. Place the crystallized sugar candy upside down on aluminum foil.Melt white chocolate candy wafers. Use a paintbrush to apply the chocolate to the rock candy (crystallized sugar).Allow the white chocolate shell layer to harden.Melt chocolate wafers and apply to the candy geode. This will be the final layer.Allow the chocolate shell to harden.Once the chocolate has hardened, the candy geode is finished.
Pour off the excess liquid from the crystallized sugar.
Pour off the excess liquid from the crystallized sugar. | Source
Remove the candy from the bowls. Place the crystallized sugar candy upside down on aluminum foil.
Remove the candy from the bowls. Place the crystallized sugar candy upside down on aluminum foil. | Source
Melt white chocolate candy wafers. Use a paintbrush to apply the chocolate to the rock candy (crystallized sugar).
Melt white chocolate candy wafers. Use a paintbrush to apply the chocolate to the rock candy (crystallized sugar). | Source
Allow the white chocolate shell layer to harden.
Allow the white chocolate shell layer to harden. | Source
Melt chocolate wafers and apply to the candy geode. This will be the final layer.
Melt chocolate wafers and apply to the candy geode. This will be the final layer. | Source
Allow the chocolate shell to harden.
Allow the chocolate shell to harden. | Source
Once the chocolate has hardened, the candy geode is finished.
Once the chocolate has hardened, the candy geode is finished. | Source

The Finished Edible Geode

Once the candy geode is completed, store the candy in a cool, dry location. Humidity will cause the sugar crystals to disintegrate, and heat will cause the chocolate shell to melt. For a fun gift, wrap the geode in plastic wrap and place a nice label on the package. For a party, display the geodes under a bright light to show off the beautiful crystals!




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Comments 17 comments

rebeccamealey profile image

rebeccamealey 2 years ago from Northeastern Georgia, USA

This would make an awesome....and delicious science project for kids. Shared and pinned to crafty projects, even though it is food. Thanks!


leahlefler profile image

leahlefler 2 years ago from Western New York Author

My kids really got a kick out of this one - they love gems and minerals, so this was a big hit! I hope you get to try it, Rebecca!


AliciaC profile image

AliciaC 2 years ago from British Columbia, Canada

What an interesting idea! Thanks for sharing the instructions. The results are beautiful.


leahlefler profile image

leahlefler 2 years ago from Western New York Author

I love science and thought this would be fun for my children, AliciaC. My boys love geodes (and all things related to geology), so this recipe was a hit in our house!


randomcreative profile image

randomcreative 2 years ago from Milwaukee, Wisconsin

This is such a neat idea! I've never seen anything like it before. What a fun project for teachers, parents, and kids alike. Thanks for sharing!


DealForALiving profile image

DealForALiving 2 years ago from Earth

I know some kids that would go wild seeing something like this and making it at home.


leahlefler profile image

leahlefler 2 years ago from Western New York Author

Randomcreative, my boys went crazy for these! They really enjoyed them, and learned about the process of crystallization at the same time.

They are a great project to try at home, DealForALiving! Fairly simple to make, though you do need to make sure you have enough time for the sugar crystals to form (this is the most time consuming part of the process).


Hezekiah profile image

Hezekiah 2 years ago from Japan

Wow these look unreal but I vet they are delicious. My daughter would love these.


Krysanthe profile image

Krysanthe 2 years ago from Bloomington, Illinois

This is awesome! Going to have to find sometime to try it with my kids, they would love it!


leahlefler profile image

leahlefler 2 years ago from Western New York Author

Hezekiah, they are really fun. They are a bit messy to eat, though! My kids loved them.

Krystanthe, definitely give them a try! They are really cool to share with the kids, especially if your child loves gems and minerals!


caseymel profile image

caseymel 2 years ago from Indiana

Wow! Bringing geology and cooking together. Looks tasty!


leahlefler profile image

leahlefler 2 years ago from Western New York Author

We are huge science fans in this house, caseymel - we might as well combine it with our cuisine!


Say Yes To Life profile image

Say Yes To Life 21 months ago from Big Island of Hawaii

This sounds TOTALLY out of this world! Though I rarely cook, I HAVE to try this! Thanks for posting it!


Kristen Howe profile image

Kristen Howe 21 months ago from Northeast Ohio

Wow! This is an awesome and clever recipe. The photos are really far out and amazing. Fun to make and delicious to eat. Voted up for awesome idea!


leahlefler profile image

leahlefler 20 months ago from Western New York Author

Let me know how it works for you! We had fun making them - my boys really loved them!


leahlefler profile image

leahlefler 20 months ago from Western New York Author

We really had fun with these, Kristen! They are a little tricky to make (not difficult, just time consuming) - but are very cool to look at and fun to eat!


Marisa 3 months ago

I'm so excited to make these with my kiddos this week! My second born is obsessed with rocks and geodes- he is going to flip when he sees this. I often find it very hard to include his activites into our family time because he has very specific (and minimal) interests that usually don't allow for any of my other three to enjoy. I can't handle seeing them walk off or get bored because I know it hurts my Nathaniel when they don't like to be a part of his hobbies. But I am positive that this family time will keep all four involved from beginning to end. So THANK YOU for sharing!

My only concern is the humidity aspect of the recipe. Considering the humidity will disintegrate the crystals once the geodes are complete, is it fair to assume that they won't even form if the humidity is too high in the area you store it in for the 2 days? We're in vacation in Maine (as in 5 minutes from the Canadian border, Maine) and for the first time in my life this place is HOT and HUMID. Very humid. And the weather report shows much of the same for the next week or so.

What is your suggestion to try and combat this problem? I'm planning on growing the crystals inside a dark pantry closet. A dehumidifier isn't an option so are fans my only alternative? I'm hoping that you're going to tell me that high humidity only affects the crystals once they're formed but won't interfere with the growing process!

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