Hindu relidion is a polythetic religion and lord Shiva is one of the gods. Hinduism is such a  religion which  worships even stone, trees, birds and animals. Its how hindus are brought up, they see god in everything and everywhere.The faith in Gods is for true.
This is the stone which is in the shape of Shivalinga and is found in a corner of Pathivara Temple situated at myanglung bazaar. The people here worship this stone as they they have the faith in god.