Narmada Shivling  - नर्मदा शिवलिंगIt is a smooth ellipsoid stone. Banalinga is also called the Svayambhu Linga: (Sanskrit) "Self-existent mark or sign of God", as it is discovered in nature and not carved or crafted by human hands.  The Narmada Shivling are quite strong and the hardness is a 7 on the Mohs scale. Narmada Stone are...