Hexasulfur is an inorganicchemical with the chemical formula S6. This allotrope was first prepared by M. R. Engel in 1891 by treating thiosulfate with HCl.[2]Cyclo-S6 is orange-red and forms a rhombohedral crystal.[3] It is called ρ-sulfur, ε-sulfur, Engel's sulfur and Aten's sulfur.[4] Another method of preparation involves the reaction of a polysulfane with sulfur monochloride:[3]
^Theilig, Eilene (1982). A primer on sulfur for the planetary geologist. NASA Contractor Report 3594, Grant NAGW-132, Office of Space Science and Applications, Washington, DC, USA: National Aeronautics and Space Administration, Scientific and Technical Information Branch. p. 4. Archived from the original on 2020-04-13. Retrieved 2024-01-10.