From VGA Planets Wiki
Alchemy ships do just that - perform alchemy by converting one resource to another.
- Neutronic Refinery Ship: Refinery converts 1 supply and 1 mineral to 1 fuel
- Aries Class Transport (Colonies only): Advanced refinery converts 1 mineral to 1 fuel (cannot be disabled by NAL)
- Merlin Class Alchemy Ship - Alchemy converts 3 supplies to 1 mineral. Can specify which mineral to emphasize with ald, alt, or alm Friendly Codes.