Bubble Rock is a fun and fascinating way to engage with geology! Bubble Rock is a natural mineral found in Utah. It's beautiful white crystals are the result of a reaction with vinegar. Similar geological reactions have created the fascinating formations that we see within caves throughout the world. Just place your Bubble Rock in a clear glass container, cover with White Distilled Vinegar, and watch your aragonite crystals grow in 1-2 weeks. Instructions included.