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Antimony(III) sulphide - Sb2S3 is found in nature as the crystalline mineral stibnite and the amorphous red mineral metastibnite.
A 2535 (OTTO) Antimony(III) sulphide (black) 95% Cas 1345-04-6 - used in the production of ruby-colored glass and in plastics as a flame retardant.