Smooth Rectangular River Rock or Cobble

This item is a naturally occurring rock or cobble with a generally rectangular, somewhat flattened shape. It measures approximately three inches in length and shows a dark gray to charcoal coloration with subtle earth-toned speckles throughout. The surface texture appears matte and weather-worn, suggesting it has been tumbled by water action in a river or coastal environment, which has rounded its edges and corners. There are several distinctive surface features, including linear striations and shallow fissures that run across the width and length of the stone. A noticeable notch or shallow indentation is present at one end, which could be a natural inclusion or a result of impact damage. The overall condition is consistent with a raw geological specimen; it is intact but exhibits numerous small chips, pits, and structural lines inherent to its mineral composition. There are no signs of human manipulation, tool marks, or artistic carving, indicating its form is entirely the result of natural erosion and geologic processes. Its weight appears substantial for its size, suggesting a dense mineral makeup common in igneous or metamorphic rock types.