Coal

Properties
Section	Solids
Spawn temperature	22°C
Heat Conductivity	80%
Relative weight	100
Gravity	0
Acid dissolve rate	2%
Flammability	0
State	Solid
Source code

Coal, burns exceptionally slow. When coal is heated, it turns orange-white, and then changes to a light grey when cooled. This aspect is shared by BCOL as well, and this effect is not visible in blob, fancy, nothing, and heat gradient displays. NEUT converts COAL to WOOD. It is also one of the few solids to absorb photons. Shatters into broken coal (BCOL) at a pressure of 4.3 after a slight delay.

Note that COAL can be heated to max temperatures without it ever combusting. LAVA, FIRE and PLSM are the only elements that can ignite it. NEUT might provide the illusion that it ignites COAL, but that is because it turns COAL into WOOD, which does have a combustion temperature.