Something that really helped me when I first started hunting for them is learning the different types of rocks in your area. Im still learning them even today. There will be certain types of rocks that the Indians used to make arrowheads and other tools with. Not all types were used. When you find some rocks out there where you hunt take a hammer and break some up to see what is inside of them. You will probably see what I am telling you as to how they will shatter or crush. Be sure to wear some kind of eye protection when you do this. Look for a site on the net to learn the types of rocks in your state. These are the types to look for in my area. Flint, Chert, Jasper, Rhyolite, Granite and quartz. If the quartz was used it should be the inside which is almost always white to crystal clear. This is a great hobby but there is much to learn. HH, rock