I agree that it's natural ..,,. I can see how the one side that comes to a point may look like an artifact but the rest of it being square and not looking worked cancels that out. I have some very large Quartz knives I have found that I can post if you would like to check them out. But I don't think I have seen any axes made out of quartz. In my area about 90% of the points I find are made from Quartz but they still used different material for axes as well as any pestles or grinding stones.