Rock Candy Geodes Recipe

how to make rock candy

Geodes are beautiful so let’s make them delicious too. Follow the step by step instructions to make fondant or chocolate rock candy geodes. You can give them as a gift on their own or use them in cake decorating.

Fondant shell

350g (12.35 ounces) fondant,
black and brown coloring

Using aluminum foil make a bowl into a rock shape and line with another sheet of aluminium foil.
Marble some grey, black and brown shades of fondant as shown int he video and roll out.
Roll out some white fondant and place over the top of the coloured fondant.
Place rock colour down over the aluminium foil bowl. You can leave this to dry out or use immediately.
Allow supersaturated sugar solution to cool slightly and then pour into the fondant shell. Leave overnight for crystals to form.
Remove any excess crystals that have formed in the middle, turn upside down and leave to dry out.
Using a sharp knife, trim off excess fondant around the level of the sugar crystals.

Chocolate shell

how to make rock candy

300g (10.58 ounces) white chocolate melts or candy melts
2 tablespoons cocoa powder

Make a alfoil bowl as shown in the video and pour in the hot sugar solution, completely wrap in alfoil and leave for 48 hours for crystals to form. Tip off excess sugar solution, peel off alfoil and leave upside down to drain.
Melt some candy melts or white chocoalte melts and pour over the back of the candy shell. Once set add some cocoa powder tot he remaining melts and pour over the top of the white chocolate. Trim to the edges of the crystals.

Supersaturated sugar solution recipe
3 cups sugar
1 cup water
few drops of food coloring
few drops flavoring

Heat the sugar and water in the saucepan and stir until completely dissolved.
Remove from the heat.

rock candy recipe

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About Ann

Hi I'm Ann, food scientist, dietitian, wife, mum to 3 boys. Join me each week for desserts, chocolate and cakes.
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56 Responses to Rock Candy Geodes Recipe

  1. John says:

    Wow! I was blown away by this. Its so cool! We always look at making some home-made gifts around Christmas time, a little bit of a competition going on to who’s is most inventive! A little early yet but I will be making these geodes this Christmas!

    Thanks for sharing a great recipe!

  2. Pingback: How to Make A Rock Candy Geodes At |

  3. Billy says:

    hi, nice post
    i like it thank for information

  4. Teresa says:

    amethyst is my birthstone!!

  5. Pingback: Feikkiherkku: syötävä geodi-mineraalikivi! |

  6. Meike k. says:

    Hello there,
    Thank you for the tutorial, I’m making this for my mother’s birthday with the words: no matter how the outside may change, your inside will always be beautiful. Only now i have a problem, the sugar solution won’t christalize. I’m using fondant shell and i nailed the fondants rocklike part, but what did i do wrong with the sugar?

    Thank you very much!
    Meike kuijer

  7. Jess says:

    Thanks for the recipe Ann, I really enjoyed making these and they blew people away.

  8. GratefulFred says:

    What temperature do you heat the sugar to? And for how long? Should it be removed from heat when it reaches that temp?

    Thank’y for this! Can’t wait to give it a try!

  9. Erika says:

    This is AWESOME! Thank you! I’m a geologist major and have a party this weekend with friends in my program so this is perfect. I just finished making the sugar solution. Have you experimented with flavouring the sugar? I wasn’t sure if it’d interfere with the crystal making process. I added a little vanilla so we’ll see how it turns out.

  10. Ruth says:

    Can you make these in the shape of an Easter egg using an Easter Egg chocolate mold, or do you have to use aluminum foil? Will the crystals not form in a chocolate mold? It would be cute to make a sugar scene with these. I can only imagine how beautiful pale yellow or green crystals would be with the white chocolate poured on the back. What flavors do you like with them? These are beautiful. I especially like the chocolate one, I like the texture of crunchy sugar with chocolate. I love your website and videos! Ruth

    • GratefulFred says:

      I think that it might work if you used foil to line the easter egg mold, prepare the sugar according to the chocolate recipe, and then coat the mold with chocolate layers and place the pre-molded sugar crystals into the molten chocolate in the mold.
      Would be interested in hearing (seeing pics of!) the results.
      Best of luck@

  11. Stephanie says:

    Hi Anne,
    My rock obsessed daughter saw this when I was searching online. Now she wants to have a rock/geode themed birthday next month. Is it possible to reduce the size of the geodes by half and still achieve same results? I have to make 20 and I was hoping to reduce my expense as well (hopefully) the amount ot time required. Please let me know!
    THNKS – Stephanie

  12. Stephanie Gribble says:

    Hi Ann,

    I loved this tutorial and had lots of fun making it, instead of adding crushed Oreo dirt, I sprinkled some extra coco powder which gave a better effect to my liking, love your videos!

    Thankyou and Kind Regards,

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