Crystals can take thousands of years to form, but the Smithsonian Magic Rocks Kit lets you create them in just hours! Just mix the “Magic Solution” with warm water, and pour it over the “Magic Rocks” that you place in your tank. Repeat this process in six hours, and watch with amazement as your rocks grow into colorful stalagmite-like towers.
Cheapest price in the interval: 12.99 on October 28, 2021
Most expensive price in the interval: 12.99 on January 15, 2022
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