Easily grow a natural aragonite crystal in a few weeks. Comes with 2 rocks. Net weight: at least 80 grams. Just add white vinegar! Place the mineral in vinegar and watch crystals form as the vinegar evaporates! Place this mineral in vinegar and watch crystals form as the vinegar evaporates! No dangerous chemicals are needed! The natural limestone rocks react and natural aragonite crystals form very quickly. Set a bowl on the table with a magnifying glass and everyone will be fascinated watching these crystals grow. Background information is included that explains the process and is the same process used in the thermal basins at Yellowstone National Park. Crystals last for years. Non-toxic. Not suitable for children under 3 years. Small parts.
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