Striations
The second most common feature to look for are striations.
Striations are the lines (scratches) left behind when one piece of material is ground against another. Some of these striations are extremely fine and produce a polished, often shiny, surface that is easy to see and feel. The most common striation features to look for are similarly sized, randomly overlapping lines often going in the same general direction.
This next picture clearly shows the size of the piece and a very common orange coloured residual material that can be easily removed by rubbing or scraping.
The piece below is about 3 inches or 7.5 mm long. I believe it could be made from flint or chert. There is a light pink residual stain visible on the top left edge.
Another well used piece. I believe it is also made of chirt.
You can see that some residual material is embedded in the striations. Both sides have been well used.
If you zoom in on the next image you will see fine striations running horizontally along this tools length. You may also notice the smooth, polished surface that was created by this action. I am not 100 percent certain but I believe this tool may be made of bone.
Orange residual staining is clearly visible on the side.
