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Message: <blockquote data-quote="kigmatzomat" data-source="post: 1662540" data-attributes="member: 9254">The hammer definition's pretty good.  Brittle is the opposite of ductile.  Ductile items bend (like paper clips) while brittle items snap (like pretzels).  Metals in general are ductile, stone in general is brittle.  (There are exceptions to every rule; cheap wrought iron will shatter like glass in many cases)I never consider living wood brittle, nor the inner bits of living creatures despite the fact that teeth and other bones are ofen fairly brittle.  Outer bits, however, are fair game so giant insects and other creatures with carapaces or exoskeletons are vulnerable to Shout spells IMC.  Crystal basically means that when you smash it the pieces are regularly formed, or at least the irregular bits are constructed of lots of smaller regular bits.  Crush salt and you get big cubes and small cubes. Smash the big cubes and you'll get small cubes.  Silicon, IIRC, is a rhomboid crystal, mica forms octangonal structures, etc, etc.  (Disclaimer: it's been >5 years since I studied geology so don't get hung up if I misremember a crystal)Lego can model crystal well.  If you build with all the same block (2x2 or 4x2) and you get a model of a pure crystal.  Smash it and you end up with sub-crystals.  Crystals maintain their shape from the molecular level up.</blockquote>