Djerfisherite is a mineral found in volcanic rocks that contains iron, sulfur, and chlorine. It has a dark color and a metallic luster. Some synonyms for djerfisherite are ferrostrunzite, chalcocyanite, and borisovite. Ferrostrunzite is a mineral that contains iron, phosphorus, and hydrogen, while chalcocyanite is a copper mineral. Borisovite is a rare mineral that has a similar chemical composition to djerfisherite. Synonyms are useful for providing alternative names for a mineral, which can be helpful for researchers and collectors. However, it is important to use the correct spelling and pronunciation of a mineral to avoid confusion.