Tantric Shiva Lingams, Sacred to the Hindu Tradition, are ceremoniously gathered once a year from the muddy banks of the narmada river,One of the 7 sacred places of pilgrimage in India. Of those found, very few have the characteristics patterning that make the tantric lingam so unique. They are naturally formed of a mineral called Cryptocrystalline quartz, with Iron oxide deposits said to have been implanted in the riverbed by a meteorite millions of years ago. Hindus worship lingams in Shiva Temples as a representation of the lord.In the tantric tradition, the shape embodies masculine energy, dynamic expression and knowledge. That markings called 'yoni' depicts feminine energy, wisdom and intuition. Together the female energy arouses the masculine urge to create. The Mineral composition and the shape make the stones unique as objects for meditation. They are said to contain the loftiest vibration of all stones on earth. Measured from the Center of Top tip to the Center of Bottom tip, Kinda like measuring circumference. We do not take a simple vertical measurement as we like to take the thickness into account.