Natural opals are unique, non-crystalline stones made of hydrated silicon dioxide, containing up to 30% water. Due to their composition, opals can dry out, crack, and are relatively soft and brittle. Found in veins and cavities within igneous or sedimentary rocks, opals are believed to stimulate creativity and enhance the enjoyment of life. They are also associated with the sacral chakra, which, when imbalanced, can lead to issues like addiction. In European cultures, opals have long been regarded as symbols of hope, purity, and truth.