Obsidian core with retouched edges suggesting its use as a tool. Some cortex remains on the exterior, some of which is covered by calcite. One side has retouch around all its edges (perimeter). This side appears to be polished to some degree and is quite flat, especially in contrast to the rest of the core's sides that have an uneven distribution of flakes removed. Overall with the exception of the one flat (polished) face, the composition of the tool is still quite bulbous.