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Antimony is a chemical element with symbol Sb and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3).
A 4051 (OTTO) Antimony shot, spherical, 1-5 mm, 99.999% - used in bullets, bullet tracers, paint, glass art, and as an opacifier in enamel.