Shiva Lingams Are egg-shaped stones of crypt-crystalline Quartz (with impurities), a silicon dioxide mineral with a hardness of 7. Shiva Lingams originate at the Narmada river in Onkar Mandhata, in western India, one of India’s seven holy sites. Villagers gather the through stones from shallow riverbeds and hand polish them to the classic elliptical proportions. Among the key features of Shiva Lingams are the reddish spots and stripes found on the otherwise gray or tannish stones. Various meanings are ascribed to the placement and number of these reddish spots.