things we know:
Atium; Hemalurgy: Steal attributes, Buring: future Visionish, feruchemy: Store Age
Lerasium; Hemlurgy: Steals Abilities, Burning: Makes them into Mistborn or enhances Mistborn abilities, Feruchemy: Unkown
Harmonium: Probably both
Trellium: Hemalurgy: Steal Investiture, Burning: Unknown, Feruchemy: Unknown
So others what would they do in these categories?