I find a lot of lithic flakes and a few points in San Juan County, Utah and would love to understand more about what materials I’m finding. But I’m new to this and feeling pretty overwhelmed with with all the possibilities and what the difference is between all the types of chert, agate, jasper, chalcedony, petrified wood, etc. I am so impressed with all the knowledge you all have and hoping you can point me in the right direction with some of the different material types I usually find. Here is example #4: