OK, it's a rock so it is old. It does have an unusual shape and yes, because of this I suppose that at one time could have been used for something by someone (anything is possible). That is only conjecture however as there is no other context to support that conclusion outside of an active imagination. An unusually shaped stone (even one with a sharp edge) does not an artifact make. In this particular case, possibly on close up examination, there might in fact be signs of it having been worked into a tool. As things stand right now however....it looks like a rock. This however is not the only instance that raises questions about your conclusions and the way they were reached or those of your archaeologist/knapper/teacher friend.
I don't know why you took a cheap shot at me earlier and frankly I could care less. It did however cause me to look back through your posts in this forum and others. Not once have you posted a picture of an artifact that appeared to be anymore then just a rock or at the best highly questionable. A "hot rock", even one that is magnetic does not a meteor make (personally, unless I can positively ID it I usually toss those damned things. One cost us an extra 2 days hiking out of a remote area because of it's effect on a compass....lol). A stone without signs of being worked by man into a tool does not an artifact make. There must be context to support the conclusions. I believe that is what most of us that ask about your conclusions are getting at.
It further seems that anyone who in the least way questions your conclusions and/or those of that friend of your's is automatically singled out and you get hostile. We ask our questions in an attempt to see why our opinions differ and possibly see reason to alter them and see it your way. This is only sound scientific principle and in no way is it meant as ridicule. You on the other hand give nothing back but conjecture.
Again, none of this is meant to ridicule you or your friend in any way. I am merely attempting to get you to see that certain guidelines must be used to establish an accurate conclusion. I don't know if you have any actual, incontestable artifacts in your collection or not. In all of your posts you have yet to reveal one. If you do, good for you but if not, that's a bit sad because I believe that you sincerely want to find and are searching for them.
With that in mind I'll make you an offer. The snow will soon be flying in your part of the country. Take a vacation and come down to sunny Florida for a week or two. We'll meet up and I'll take you artifact and treasure hunting. You'll have your own personal guide (and not a bad one either....lol). You may not find a gold escudo or a silver reale but I'll take you to the beaches where it is more the possible. We can also go onto some of the property I have permission to hunt on and find everything from pottery shards to points on a regular basis. On a couple of day long canoe trips into wilderness areas (yes, they really do still exist here) I can show you mounds and old village sites from the Seminole Indian Wars that will appear on no ones archaeological survey and many that have never seen the pot hunters shovel. There is absolutely no doubt what these are as soon as they are seen. In most cases the evidence is in such abundance that it is amazing.
Want to dig up a Spanish Cannon from a treasure galleon that is under about 4' of sand and take a picture, no problem. Do you dive or snorkel? If so and water conditions permit, how about swimming off the beach a bit and in 6' feet of water seeing Spanish cannon laying on the reef. A bit further and there is a pair of crossed anchors. How about a 60' long pile of ballast stones, it's top only a few feet underwater at low tide. Hell, take one home for a door stop. All of these places are real, they exist and you can have your picture taken over, on, and around them. There is no question about what they are. These are artifacts, actual sites and there is no question about their authenticity.
Why am I offering this, because that's what I do, teach and share knowledge. The vast majority of the great archaeological and treasure finds have been made by either accident and/or by amateurs. Most of these were based on solid research and dedicated effort with focused intention, not innuendo and conjecture. Learn what to look for and where to look for it. Look for the signs that are there and see them for what they are, not what you want them to be. In short, keep an open mind. Well, the offer is there, have a good one.
Deepsix