G = E/2(1+u) where G = mod of rigidity and u =poisson ration and E = young modulus
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well the relation is i don't know .dam i thought i know
It is around 40 GPa.
there are different types of modulus it depends on what types of stress is acting on the material if its direct stress then then there is modulus of elasticity,if tis shear stress then its modulus of rigidity and when its volumetric stress it is bulk modulus and so on
http://www.engineeringtoolbox.com/modulus-rigidity-d_946.html
E=3k(1-2/m)