Crystals are a unique and fascinating phenomenon. Occurring naturally, they are the result of a several factors. These include pressure, temperature, and the presence of water. Upon discovering the concept of Hydrogen as a fuel source, efforts were made to transform the gas into a more usable and prolonged substance for fuel. As a gas form, the Hydrogen was expended too quickly to make it viable. Combining variations of heat, pressure, and water as the catalyst, the Hydrogen gas was transformed into a crystal form which was expended at a much slower rate when used in a starship reactor.
The purpose of these refineries is to take the hydrogen gas from planets and utilize this method to turn them into crystal. Crystallized hydrogen is a very valuable commodity that is constantly in demand.