It was named by geologist T. H. Holland in 1893 after the tombstone of Job Charnock, in St John's Church in Calcutta, India, which is made of this rock.
Foi nomeada polo xeólogo T. H. Holland en 1893 pola lápida funeraria de Job Charnock, na igrexa de San Xoán de Calcuta, na India, que está feita desta rocha.