Creatures of FASA

FASA 365 Day 239, Calculus Minutum, (Coal Mite).
Small insect (1/8″) normally found in trees in the Gruv.
Normal diet is bark and other high carbon material, however they prefer coal and coal dust, and will actively seek out and infest coal stores.
They are surprisingly resilient. Able to resist high temperatures, including camp fires, and beyond. Ssuch sources as active as steam engine fireboxes.
Excretes a sticky, flammable, tar like residue which will rapidly wreck engines and has caused explosions.
Reproduces rapidly when there is a sufficient source of food.
Artists Note: Again, this was written by one of our 1879 Writers.
I personally couldn’t resist camouflaging the insect with an exoskeleton similar to the bark that it eats.