Attacks generally aren't associated with a material. In HL, (like in a Bestiary) this would normally be shown as a Special Ability for a creature that says something like "Attacks made by XXX are treated as being adamantine."
You can also make it part of the attack name as ploturo suggests.
Current RPG's: Pathfinder (GM), Pathfinder (Player), Gamma World (GM, Pathfinder homebrew).
HeroLab: 3.5 & Pathfinder. HL User Files for PF: Greyhawk Setting, Gamma World (WIP).
DM and player of D&D since 1980.
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