well the one on the left is a Elora and I only know that cause it is the type I find. I see most of the ones you find are all that same type of stone. Is the dirt red like here? If so they must really stand out.
So the sandy type produce more then? I know when I hunt quartz it is always on a red clay bank. If it aint red clay there is nothing but rocks.
It may be my imagination but it seems that I find more whole points in sandy soils than in clay.