These stones are made of cryptocrystalline quartz and legend has it that they were formed when a meteorite fell to Earth several million years ago. The natural movement of the river is thought to help create the egg or oval shape of the stones. They only come together one day a year and are hand polished to give them a smooth, shiny surface. Lingam stones are said to have one of the highest frequency vibration rates of all stones on earth. They emanate a vibration that will purify your sacred space. The shape of the stone represents masculine energy (knowledge) and the marks, which differ greatly from one stone to another, represent feminine energy (Wisdom). The Shiva Lingam also represents harmony and balance and facilitates the union of opposites, such as the masculine and the feminine or the body and the soul. Note: Please note that the measurements are approximate, they may vary from lot to lot.