Incendiary gel (Earth-5875)

Incendiary gel is a type of ammunition used in some of the weapons of the dissolved Covenant and its splinter factions.

Overview
It has two known variations: the first is a green, radioactive substance used in the assault cannons used by mgalekgolo and in fuel rods. The mgalekgolo's assault cannon is capable of firing the gel in mortar-like projectiles or in a single stream of fire, depending on type. Fuel rods are attached to canisters that explode during impact.

The Type-3 firebomb, a grenade of jiralhanae design, employs adhesive incendiary gel to function, containing a hazardous mixture of caesium, burning at twenty-two hundred degrees Celsius.