Rock Candy Supersaturated Sucrose Crystal Geodes
An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 7 to 12.
Materials Needed
- • Granulated white sugar (3 cups)
- • Water (1 cup)
- • Wooden craft skewers (3 units)
- • Wooden spring clothespins (3 units)
- • Clear glass mason jars (3 units)
- • Liquid food coloring (1 set)
Pro Tips
- → Dissolve 3 cups of sugar into 1 cup of boiling water until completely clear to create a supersaturated solution.
- → Dip wooden skewers into water, roll them in dry sugar to create seed nucleation crystals, and let them dry completely before inserting.
- → Suspend the seeded skewers inside jars of cooled syrup using clothespins: massive quartz-like sugar crystals precipitate over 7 days.
Safety First
Adult boils and handles hot supersaturated sugar syrup. Hot syrup can cause severe burns.
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Step-by-Step Instructions
Step 1
Dip wooden skewers in water, roll the tips in granulated sugar to create seed nucleation sites, and let dry for 30 minutes.
Step 2
Boil 1 cup of water and gradually stir in 3 cups of sugar until completely dissolved, then tint with food coloring (adult prep).
Step 3
Pour the hot syrup into clear glass jars, allowing it to cool for 15 minutes.
Step 4
Suspend the seeded skewers 2 cm above the jar bottom using clothespins and place on a quiet shelf to watch crystals form over the week.