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The milky white crystals that will form on the rock are a form of Aragonite. Place the rock in a small dish. Pour White Distilled Vinegar over the stone. Fill the container to within ¼” of the top of the rock for that is where the crystals will grow. The crystals will begin to grown within 12 hours. The crystals form as a result of the chemical reaction between the stone and the acid in the vinegar. A drop of food coloring will color the crystals. Wait a week after the vinegar is gone to harden the crystal before removing