Stephen, post it here. Use the bottom tool bar. Count six boxes from left to right. The first icon with the silhouette of two mountains and the sun will give you three options to upload photos into your post.
Also tell us where you found it. A simple statement like on a hillside near an iron mine in Denver Colorado. That will tell us a lot. A statement like that gives us geographical context and tells us something about the area in which you found it. You might go farther by stating it is brittle or very hard, light shines through it, it scratches glass, it leaves a white streak when tested, it is magnetic.