Hey Greg, from experience I can tell you that working with obsidian is just like working with glass, except that obsidian may cut you just a little faster. Guess what I am trying to say is that having some obsidian is nice, but since you are just starting out, you may want to practice on some glass first so you don't waste the obsidian when you do get some. I did that, wasted some good obsidian before I knew what I was doing. I really didn't understand setting up platforms and that it doesn't take as big a strike on obsidian, so I ended up crushing a lot of obsidian with nothing to show for it except some color. I had some really pretty snowflake obsidian and I think some rainbow. Hind sight, but I would love to have that rock back. Anyway, just a thought I thought I would share.