The Shiva Lingam stone is made of Cryptocrystalline Quartz.
In it's naturally occurring oval-shaped form, they are a sacred stone in the Hindu culture. The shape is considered a phallic symbol of the Hindu God Shiva.
Shiva Lingam stones are a rare and powerful stone that is found in one of the seven holy sites of India ~ the Narmada River in Onkar Mandhata. They are collected at the river bank once a year.