Amulet stone is a type of Rhyolite, a silica-rich mineral with a hardness of about 7. It is from Central Australia. The Aborigines call the stones “Uluru's children". Amulet Stones offer a specific type of vibrational protection... It's not that they repel negative energy, but that they vibrate so positive that there is no resonance with negative people or energy. Attuned to the Earth, they can aid in regular sleep patterns, and dispel bad dreams. From The Book of Stones.