Talk:Iwa Iwa no Mi/@comment-1949750-20121008102827/@comment-3387274-20121008132600

our rule on specifics is that they are acceptable only if they have significantly different properties to the default for that substance; for instance potassium, magnesium and mercury, are allowable allong side a generic metal fruit, whearas copper, lead, and steel aren't

If you can come up with something specific that has differing properties, then there is no problem.