Shaligrams, holy stones in the Hindu culture, are said to be natural forms of the Lord Vishnu. These fossilized rocks are black in color and are found mostly in the Kali Gandaki River valley of Nepal and are formed through centuries and are characterized by distinctive spiral markings and chakra-like impressions. Shaligrams are venerated as they are, unlike carved idols, in an express... https://vedicvaani.com/rudraksha-and-yantras/shaligrams