Synonyms: Ferrous sulfide Formula: FeS Formula Weight: 87.91 CAS No.: 1317-37-9 Density: 4.84 g/mL at 25 °C(lit.) Features and Benefits: Non-stoichiometric, inhomogeneous product Supplemental Hazard Statements: Contact with acids liberates toxic gas. Packaging: 250 g in poly bottle Packaging: 5 g in glass bottle