Are you 100% sure that is Hematite? It doesn't really look like Hematite in your pictures. It looks more like what I refer to as Ironstone, which is similar to Hematite, just not as dense or as heavy.
As for the markings, I agree that they look like plow scars.
It looks like hematite to me. I find a lot of hematite, and most of it is just seems like they used it for abrading purposes. It will be smooth and polished on one side if not all. Some of the hematite I find has cuts in it almost like it was used to sharpen a kitchen knife or something. I don't know if that makes sense to you or not. I have several examples if you need. I love hematite, and pick up quite a bit of it in my neck of the woods.
I find Black and brown hematite, I even have some that has a red tint to it ,like blackcherry.. Some hematite is more dense than others. I would bet anything that its hematite, I only have a couple hundred pieces of the stuff. I am not saying that those are not plow dings, but I am saying the piece was used due to the polish on it. OK that's my final opinion. John P.s I have always believed that hematite was Iron ore. Whats the difference, between Ironstone, and iron ore?? If you were to rub that stone on another, you should get a red powder.
i find alot of hematite that is polished from the glaciers,different colors also red,black some with yellow and purple mixed in,also find alot of hematite concretions,i think thats what is called iron stone,hematite shell covering a soft yellowish core
I did some reading on hematite when this subject came up a few months ago here. Hematite is the official Alabama state mineral, and is also known as red iron ore (at least in Alabama). In can be VERY red, In fact, the mountain in Birmingham where the TV stations and Vulcan (iron man statue) are located is called red mountain for just that reason.
Here are some Hematite artifacts I have. As you can see it does vary in color from red to dark black. The black is usually a little denser and higher quality than the red which is usually a little softer. I still believe what is shown in the first pictures is Ironstone and not Hematite.