How to Create Crystals with Common Kitchen Ingredients

young girl cooks with man

Need fun STEM activities for kids?  Whether your student is enrolled in an online school like Connections Academy, is homeschooled, or is in a traditional brick-and-mortar school, all students can benefit from at-home, fun science experiments - especially when it comes to STEM learning.     

With over 20 years of experience in making home learning fun, get ready to brush up on your geology and try out this science activity for kids. The best part? You don’t even need to run to the store.  It’s time to crack open some eggs and encourage your child to make their own geodes with common kitchen ingredients. 


Geology for Kids

In case your elementary student isn’t particularly impressed with their science lessons right now, it might be time to take matters into your own hands and switch things up. Help them to study geology! Make science fun by introducing your k-5 student to the concepts of geology, solvents, solutes, and chemical reactions. 


Geology Activity for Kids


Create Your Own Eggshell Geode Crystals from Home

Let’s get to the science activity! Here are the common kitchen ingredients to get started with making your own geode crystals from home.  


Here’s what you’ll need:

  • Hot water 
  • 3 Eggs 
  • Sugar 
  • Baking soda 
  • Table salt 
  • Food coloring (red, blue, and green) 
  • Cupcake pan 

Download Egg Geode Crystal Experiment


A Quick Geology Background


What are Geodes?

Geodes are hollow spherical rocks with cavities that are usually lined with crystals. A crystal is solid material that has formed in a strictly ordered arrangement guided by the atomic structure of the mineral the crystal consists of.  

The inside of a geode is usually a display of tiny quartz crystals underlain by multiple bands of translucent gray and white agate. Others have crystals of purple amethyst, white calcite, blue gem silica, or pink rhodochrosite. In some geodes, additional colors show up under fluorescent light. 


Where Do Geodes Come From?

Geodes are mostly found in sedimentary and igneous (volcanic) rock. Geodes form in many different ways, such as when rock forms around a pocket of gas or an empty space in the earth. Minerals in the groundwater that seeps in and out of these hollow rocks over thousands of years are deposited and grow into crystals. 

You can find a lot of geodes in the Midwest, particularly where Illinois, Iowa, and Missouri meet, and in the deserts of the Southwest, including in California, Arizona, Utah, and Nevada.  


How Do You Identify a Geode?

Geodes are typically round or oval with a lumpy surface, but you can’t determine exactly what’s inside one until you break it open. If you find a rock you think could be a geode on your property or property where collecting is allowed, break it apart by tapping it with a hammer, or have someone cut it open with a powerful saw. You’ll know once you see the interior whether it is hollow and has crystalline growth. 


Someone Mentioned Solvents and Solutes?

solute is the material that dissolves in a solvent to form a homogeneous mixture called a solution. In a geode, minerals are solutes that have dissolved in groundwater (the solvent) to form the solution that leaves behind deposits that grow as crystals in the hollow of the geode. The change that two different substances undergo when they are mixed together is known as a chemical reaction

Can you identify the solute and the solvent in our Eggshell Geode Experiment? 


More Science Experiments at Home

Don’t let the science fun stop here. If they’re interested, allow for the start of a kid’s rock collection in your home. Or encourage their exploration with the other sciences. Whatever the case, learning from home with an accredited online school like Connections Academy can make all the sciences exciting again. 

Check out our other fun science experiments for kids to keep the home learning going.  

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