Shaligram
A shaligram, or shaligrama shila (Devanagari: शालिग्राम शिला; IAST: Śāligrāma-śilā), is a fossilized stone or ammonite collected from the riverbed or banks of the Kali Gandaki, a tributary of the Gandaki River in Nepal. It is also considered a form of Vishnu within Hinduism.