Talk:Crystal Manipulation/@comment-2197197-20120608201012/@comment-4714517-20120608202415

Diamond, but it's also more fragile if you hit the right point.

Most crystals are pretty much like normal stone and can take as much pounding as any block of quartz... with some chipping and so on, before actually breaking.

With diamond you can pretty much take a jack-hammer to it without even scratching... except when you hit that exactly right spot and the whole thing either cleaves to pieces or shatters completely.