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Thames and Kosmos | Crystal Growing

Grow dozens of dazzling crystals and conduct 15 illuminating experiments with this classic science kit. 

  • Experiment with four chemically different crystals each with different properties, including potassium alum crystals that form regular octahedrons, rapidly growing sodium sulfate crystals, long needle-shaped sodium acetate crystals, and plaster which is made from gypsum crystals. 
  • Mold fun plaster shapes, including stars, lightning bolts, dolphins, and pyramids, and grow layers of crystals on them. 
  • Use dyes to form colored crystals, and mix the dyes to grow a rainbow of custom colored crystals. 
  • Display your crystal creations in a clear treasure chest with a locking lid. 
  • Mold your own geode — a hollow rock with crystals growing inside — and create a beautiful crystal cavern inside. 
  • Experiment with growing crystals rapidly and slowly, and observe how that affects the crystal structures. 
  • See if you can grow one giant crystal, and many small crystals on the surface of a rock. 
  • Measure how the crystallization of solids out of a solution, and the dissolution of crystals back into solution, affect the temperature of the solution. 
  • Learn about the energy of crystallization. 
  • Investigate solutions, crystallization, and the chemistry of crystal growing. 
  • Learn about the structures and geometries of different crystal shapes. 

    This kit is thoroughly tested and safe: 

    Over one million units of this kit have sold worldwide. 

    A full-color, 32-page experiment manual guides your experiments in crystal chemistry and Earth science.

    For Ages: 12-15

    WARNING: Chemistry Set. This set contains chemicals [and/or parts] that may be harmful if misused. Read cautions on individual containers [and in manual] carefully. Not to be used by children except under adult supervision.