Dirt

There are 2 categories rubble dirt - 'dirt' and 'dirt patches'. None of either category can be stacked, dyed, or rotated. Each consists of just a scattering of pixels, making them not only hard to pick up, but nearly indistinguishable regardless of hue.

Dirt Patch
Rubble dirt patches come in 2 types. Each only comes in hues 0 and 1175.

Dirt
Rubble dirt comes in 3 types. Each can come in 6 different hues.