Instructions
Examine the entire rock for any indication that it has been carved or chipped in any way. If it appears to have been carved, this will tell you that it was likely partially or fully made into an Indian stone tool at some point. Stone tools were often made with small to medium-sized stones that could be held in the hand or secured to the end of a stick. Larger stones were used for building and securing structures rather than for tools.
Look specifically at the ends of a carved stone. Unfinished stone tools, known as preforms, were used by Indians as blank sets to make tools from. They have been carved into an egg-shaped piece, but they do not have a distinctively-sharp point to indicate use as knife or arrow tools.
Identify an Indian stone knife tool by its rounded edges that meet at a sharp tip. While Indian stone knife tools have pointed tips, they are not pointed at an extremely triangular angle. You can recognize an Indian stone knife or arrow tool by its sharp, triangular shape that comes to meet at a very pointed tip.
Look to see if a large round stone has been carved to a sharp angle on only one edge. This is an indication that it is a tool known as a chopper used to create a sharp and heavy cutting edge.
Identify Indian stone tools that were used to drill holes in leather, wood, shell and other natural materials. These tools, known as drills and awls, can be identified by their small and narrow drill-head appearance.
Look at the edges of the stone tool to see if it has toothed edges. These stones can almost always be identified as tools called saws. Saws were used to scrape the edges of pots and carvings.