I think it looks like a obsidian point. I found it in a customers crawlspace. Since it's the only obsidian I've found in the area, I'd have to guess it's probably a glass reproduction. Any way to tell?
I found it san pedro,ca. I held it up to the light and its transluclent, like the one in the photo. I find all kinds of kids toys,marbles, coins,etc. going back to the 1940's in and around my clients floor furnaces. I've collected some really cool marbles over the years, and I figured this was something that ended up in the crawl space like the rest of it. Compared to the other rocks I had been finding, it looked to good, so I figured it was a modern glass copy.Thanks for all the helpful opinions, much appreciated!!!