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4lb chunk of obsidian, time to dig in !

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Stringman:
The first and third pic shows a pronounced peninsula. I would try to reduce that by a 1/2" or so. This will make it less likely to break where you don't want it too. Otherwise study it and run your ridges. Create good solid platforms that are slightly less than 90• to your flaking face and then give it a solid hit. You should be able to get a nice handful of useful flakes before focusing on your core pieces.

Have fun and post pics!

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