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Thames and Kosmos

Glowing Crystal Geode


Ages 7+

Create your own crystal geode – a round rock containing a crystal-filled cavity.

First, cast a plaster geode shell in the mould and then fill it with a crystal-growing alum salt solution. The crystal solution contains an ultraviolet light. An ultraviolet flashlight with holder, as well as a display stand for the geode, are included. Display your beautiful specimen day and night!

Learn about how crystals form and why the pigment glows under ultraviolet light.