Shiva Lingam (Lingham) stone egg from India.  The riverbed of the Narmada River in India is made of this crypto-crystalline Quartz.  Every year at a certain time of year these stones wash up on shore that have been tumbled in the riverbed, which are then crafted into the egg shape by local artisans.  They are considered very sacred and powerful in Indian culture and seen as a symbol of fertility. The stones are found naturally in only one place on earth at only one time of year.  The Narmada River has had a dam built in it, which will make the supplies of the Shiva Lingam more scarce as the natural water flow has been interrupted..