This exceptional specimen features sharply defined, dark sphalerite crystals (ZnS) with a submetallic luster, beautifully adorned by sparkling clusters of milky-white calcite (CaCO₃). The sphalerite forms the primary matrix, while the calcite develops as secondary crystallization across its surfaces, illustrating a classic paragenetic relationship typical of hydrothermal zinc-lead deposits.

The striking contrast between the deep, lustrous sphalerite and the delicate, translucent calcite highlights the mineralogical beauty and geological harmony of this association. Both scientifically significant and visually captivating, this piece is an outstanding example of Calcite on Sphalerite.