Gift Cards


11 in stock
Curbside Pickup Available or home delivery on in-town orders*

Recommended for ages 10+ years

25 pieces, 15 experiments

Grow dozens of dazzling crystals and conduct 15 illuminating experiments with this classic science kit by Thames & Kosmos. Experiment with 4 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.

Grow three chemically-different types of crystals that exhibit not only different colors, but also different shapes. Build three-dimensional geometric models of common crystals shapes including octahedrons, tetrahedrons and rhomboids. Mold your own crystal geode. This is a hollow rock with crystals growing inside!

Learn how to test and identify minerals with your very own collection of real specimens included in the kit. Conduct tests to determine a mineral’s chemical and physical properties such as color, luster, streak color, hardness, density, magnetic properties, and carbon, sulfur or iron content.

Investigate the geologic rock cycle and learn how the three main categories of rock: igneous, sedimentary, and metamorphic rocks are formed, altered, destroyed and formed again.

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.


  • Introduction to crystal growing in 15 experiments!
  • Grow crystals with varying chemical composition, colors and shapes.
  • Test and determine a mineral's chemical and physical properties.
  • Develops scientific thinking and an interest in geology.
  • Created in cooperation with National Geographic.
  • Kit includes: Geode mold and basin; mold for plaster figures and shapes; bag of plaster (calcium sulfate); potassium aluminum sulfate (alum), one 50 g packet and four 20 g packets; sodium acetate; sodium sulfate; lid remover; pipette; 3 wooden spatulas; 5 dye tablets; 200 mL measuring cup with lid; three 30 mL measuring cups with lids (red, blue and yellow); treasure chest; and a 32-page, full-color manual with instructions, experiments and fascinating information on crystals and geodes.*
  • Develops and interest and skills in crystals, geodes, chemistry, geology, science, experimenting and observation.
  • Supports STEM learning.
  • Award winning: Creative Child Magazine Preferred Choice Award
  • Package measures 17 x 12 x 4 inches (LxWxH); weighs 2.9 pounds.
  • WARNING: Requires use of a stove or hot plate and very hot water. PARENTAL SUPERVISION IS STRONGLY RECOMMENDED.

*Additional supplies needed but not included are: Distilled water, adhesive labels, pencil, transparent tape, thermometer, paper towels, pot holders, old cooking pot, electric hot plate or stove, empty jelly jars with lids, yarn or nylon string, scissors, old newspapers, empty yogurt containers, all-purpose glue, small pebbles, sandpaper,  cloth handkerchief, knife, and rubber band.

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