These egg shaped stones come the Narmada River in India at one of India's most holy sites. They are very strong and grounding stone. The Shiva Lingam encourage you to see your unique qualities within yourself and connect spiritually,
The stone symbolizes the unification of Lord Shiva with Kali and the masculine and feminine. It activates the lower chakras and also works with the kundalini energy. It also contains the shape of the cosmic egg.
I have them in my healing office. One of my favorite ways to use it is to help ground clients. You can run it up and down the spine as well as ground the feet.