Heridium is a Silicate element, commodity and crafting material in No Man’s Sky. It is used to craft Antimatter and some upgrades.
- On planets it can be mined from tall rocks. These are quite common. You can fly close to the surface with your starship to spot them. They give hundreds of heridium per rock.
- Can be bought at any space station from the trade terminal and merchants. They usually sell 20-50 heridium (you need 50 for crafting antimatter).