"Wait, that didn't work right" - the Dysfunctional Rules Collection

[mattie_p]

Adamantine Weapons do not bypass Adamantine DR, as an Adamantine weapon only bypasses Adamantine Damage reduction with upto 20 points of hardness, the average piece of adamantine armor has at least 30 hardness

Materials gain hardness for each inch of thickness. this means that that a 5*5*5 cube of dirt is harder then your adamantine shovel

Materials gain hp for each inch of thickness, hardness remains unchanged. Adamantine has 20 hardness, and ignores hardness of less than 20, so it does not ignore adamantine hardness.