Natural Attacks + Impact Weapon Property

[Duskblade]

I was going over my newly purchased Ultimate Equipment book, and found a weapon ability that struck me as very promising:

Impact: This special ability can only be placed on melee weapons that are not light weapons. An impact weapon delivers a potent kinetic jolt when it strikes, dealing damage as if the weapon were one size category larger.

Now, the idea occurred to me to add this weapon property to the Amulet of Mighty Fists in order to increase the damage of Natural Attacks (lets say, by using a Barbarian for example, one who has Beast totem rage powers).

However, what I can't seem to find is if a natural attack counts as a light weapon or not. Does anyone know if it does? Thanks again for the help.

[Caderyn]

Probably doesnt work, I would say that unarmed strike is likely to be considered a light weapon, and thus the amulet of mighty fists major limitation "as long as the ability can be applied to an unarmed strike" provides the stumbling block preventing it being applied to the amulet and thus to your natural attacks.

[Gauss]

Duskblade:

CRB p136 Weapon Finesse wrote:

Special: Natural weapons are considered light weapons.

However, it is dangerous to draw a line from a special rule to a general principle. But since there is no other comment as to the status of natural weapons this will have to do until someone can find something else.

Caderyn: Unarmed attacks are not listed as a light weapon in the list of weapons (CRB p142). By that criteria it would be considered doable. With that said, Natural weapons are not unarmed attacks and are not on the list of weapons so the only comment (that I could find) we have as to whether or not Natural Weapons are light is Weapon Finesse.

- Gauss