Roussin's salt

noun

Rous·sin's salt | \ ˈrüsə̇nz-\

Definition of Roussin's salt

: any of two series of alkali metal salts that are nitrosyl and sulfur complexes of iron:

a : a red unstable salt having the general formula M[Fe(NO)₂S] and obtainable by reaction of nitric oxide with ferrous sulfide

b : a black more stable salt having the general formula M[Fe₄(NO)₇S₃] and obtainable (as by treatment with alkali) from a red salt

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