Fictional materials
- Adamant (Greek Mythology)
- Cortosis (Star Wars)
- Dilithium (Star Trek)
- Drogium
- Duranium
- Eludium
- Kryptonite (Superman)
- Latinum
- Mithril (LoTR)
- Octiron
- Phlogiston (superceded scientific theory)
- Redstone (Minecraft)
- Rivium
- Runite (RuneScape)
- Tritanium
- Unobtainium
- Uridium
- Viridium