Goop

Smelting ore returns a Goop item for that ore which can either be put in a vial or re-smelted into Ingots.

Plasma goop is acquired by smelting acid vials in the plasmificator. Plasma goop can be used as fuel for the Plasmificator and it can be re-smelted into Plasma.

Types
The goops shown in the picture are (going left to right): Uranium Goop, Netherflow Goop, Plutonium Goop, Radionite Goop, Neptunium Goop, Obsidium Goop, Plasma Goop and Cryonite Goop.