This specimen features an impressive combination of transparent, light yellow calcite crystals perched on a pyrite matrix from the Sweetwater Mine in Ellington, Missouri, USA. The calcite crystals have a distinctive elongated, sharp shape, giving them an almost “butterfly-like” appearance. Their delicate color, combined with their luster and clarity, creates a striking contrast against the darker, metallic pyrite base. This piece stands out for its aesthetics and fine display quality, representing a classic example of mineralization from this renowned American locality.