code/modules/materials/Mat_Materials.dm 
| /_is_abstract/datum/material | Base material datum definition |
|---|---|
| /_is_abstract/datum/material/metal | Base metal material parent |
| /_is_abstract/datum/material/organic | Base organic material parent |
| /datum/material/metal/glowstick | Material for bundles of glowsticks as fuel rods |