Natural Black Shaligram Shila Saligram from Gandaki River of Nepal.
Each Natural Shaligram has different shape and size so don't compare with the main page pic.
According to Shastras, keeping Shaligram ji benefits the family in 6 dimensions: Noble way of life, Wealth, Protection from evil, good health, worldly pleasures and blessing from Lord Vishnu.
It is highly auspicious to worship Shaligram ji in religious functions like Satyanarayan Puja, house warming (Griha Pravesh),marriages and other pujas and holy occasions.
All Shaligram pieces are different as they are naturally formed. They all have different colour, size and texture.