Rough Chalcedony or Agate Specimen with Inclusions

The item is a small, irregularly shaped mineral specimen. It appears to be milky white to translucent in color with significant patches of adhering dark brown to black material, likely dirt or other sediment. The surfaces are generally smooth and rounded, suggesting it has been naturally tumbled or weathered. There are several areas where the white material is more transparent and exhibits a glassy or waxy luster. Notably, there are distinct brown, worm-like or spiral patterns embedded within the translucent areas, particularly visible in the upper left and upper right sections of the image. These inclusions appear to be organic or mineral deposits within the stone. The piece is held between fingers, providing a sense of scale, indicating it is a pocket-sized piece. The adhering dark material obscures some of the surface details but highlights the contrasting white base material. There are no visible manufacturing marks, signatures, or stamps. The overall impression is of a natural stone with interesting internal patterns, possibly a type of agate or chert with fossilized inclusions or dendrites. The visible condition issues are primarily the adhering dirt. The inherent quality appears to be that of a natural, unworked specimen with aesthetic appeal due to its unique inclusions. It looks like rough chalcedony or agate with some kind of internal formation, possibly a small geode or nodule fragment.