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Ordinary web searches are not turning up lists of the most rigid materials for me.

I am interesting in finding out the relative rigidity of commonly available materials and how to measure that rigidity (Young's Modulus?)

Some of the rigid materials I can think of are (1) hardened steel, like 4140 or tool steels, (2) silica, (3) granite, (4) basalt, (5) boron nitride, (6) tungsten carbide

How can I compare materials like this to determine their relative rigidity?

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    $\begingroup$ The quantity you're looking for is stiffness, which is directly proportional to Young's modulus. $\endgroup$ – lemon Nov 2 '16 at 21:21
  • $\begingroup$ Diamond is more rigid than any of your guesses (e.g. 6 times stiffer than typical steel alloys). Grapheme and carbon nanotubes are about equal in second place. Materials like granite aren't even on the radar - it's twice as flexible as copper, but much less ductile of course. $\endgroup$ – alephzero Nov 2 '16 at 23:33

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