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quote:Originally posted by tweenerHow fine do you need it and how much do you need? Several types of rock and lava come to mind, but if you need a fine powder or very much, it could be a problem.----John - The Eternal Pessimist.
quote:Originally posted by tweenerI thought of obsidian, but then thought that it might be too reflective, thus sending shards of laser beam all over the place. I was thinking of the black pummice that looks like a hard foam. It has matte surfaces and is relatively soft and easy to crush. I'm sure there are better substances, but I don't know what they are.----John - The Eternal Pessimist.