Antimony(III) Sulfide, Pieces, 99.999% (Trace Metals Basis), 10g For Research & Development Not for drug, clinical use in humans, for food or food additive use Certificate of Analysis: Assay (Metals Basis) 99.999% Appearance (Color) Dark Gray Appearance (Form) Pieces ICP Analysis Confirms antimony component Melting Point 550ºC Particle Size 40mm & smaller Specific Gravity 4.64 Total Metallic Impurities (ppm): Ag