I live in the suburbs of Detroit Michigan. I have been collecting rocks for years. I have found some obsidian near a water shed where I work, while planting trees.
It is amazing that ancient Indian trade extended this far east, from Yellowstone. The obsidian I found is a dark green and still has its sharp edges. One piece has the appearance of lava folds.
thank you for your article, it has been helpful. If you would like a piece I can mail it to you. contact:[email protected]
Thanks, John Murray
Something is not right. This message is just to keep things from messing up down the road